These helper T-cells produce small signaling molecules called cytokines, which activate B-cells and macrophages.

辅助T胞会产生些小的信号分子，即胞因子，激活B胞和胞。

The brain signal is a very, very small signal and muscle activity is very strong signal.

大脑信号是个非常非常小的信号，而肌肉活动是个非常强的信号。

At least in New England, we're seeing a small but important signal that conservation leads to job growth.

至少新英格兰地区，我们看到了个微小但很重要的信号，即保护环境会带来就业增长。

I have always been fascinated with how small electrical signals in discrete parts of the brain lead to big behavioral changes.

我大脑离散部分的小电信号如何导致大的行为变化着迷。

Sandstorm flashed him a questioning glance, but Fireheart gave a small signal with his tail and the orange she-cat sat down.

沙风询问地看了他眼，但火心用尾巴轻轻示意了下，橙色母猫坐下了。

The sympathetic nervous system is set up in such a way that even a small stress signal sent down one path could trigger a response in many effectors at once.

交感神经系统是这样建立的，即使是沿着条路径发出的微小压力信号也能同时触发许多效应器的反应。