Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是需要跳蚤或动物媒介，而是由人传人吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几的发疹伤寒病原体（可由壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发病原体（可由壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是人人经空气吸染沬。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

几种不同的发疹伤寒病原体（可壁虱，跳蚤，虱子等寄生虫）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

几种不同的发疹伤寒病原体（可壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是人人经空气吸染沬。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

几种不同的发疹伤寒病原体（可壁虱，跳蚤，虱子等寄生虫）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性不需要经跳蚤或动物媒介，而由人传人经空气吸入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁虱，跳蚤，虱子等传播）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

性鼠疫是不需要经跳蚤或动物媒介，而是由人传人经空气吸入受感染沬传。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁虱，跳蚤，虱子等寄生传）的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是不需要经跳蚤或动物媒介，而是人传人经空气感染沬传。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

种不同的发疹伤寒病原体（可壁虱，跳蚤，虱子等寄生虫传）引起的疾病被人们称为斑疹伤寒。

Martha's approaching her century and as wick as a flea.

玛撒快满百岁了，却敏捷得像只跳蚤。

Fleas are parasites.

跳蚤是寄生虫。

Septicaemic plague occurs when infection spreads directly through the bloodstream, while the pneumonic form is the most virulent but least common.

肺炎性鼠疫是需要经跳蚤或动物媒介，而是由人传人经入受感染沬传播。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由同的发疹伤寒病原体（可由壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。