Once, they were made entirely of natural rubber.

以往，轮胎天然胶制成。

Plastic vegan belts and shoes made from tree bark or natural rubber labelled vegan.

塑料皮带，以及树皮或天然胶制成的鞋子都被标记为“纯素”产品。

Until recently, sneakers used natural rubber for this process.

很长时间以来，在这个过程中，运动鞋的制作都是使用天然胶。

But today, most outer soles are made with a synthetic blend of natural rubber and byproducts from coal and oil.

但是如今，大多数外底材料是天然胶和煤及石油的副产品混合而成。

It is usually cheaper than natural rubber.

它通常比天然胶便宜。

Some of that will be natural rubber obtained from the sap of rubber trees.

其中一些将是从胶树的汁液中提取的天然胶。

40.Natural rubber wood no longer had a stranglehold on rubber supplies.

40. 天然胶木材不再束缚胶用品。

People get natural rubber from rubber trees as a white, milky liquid, which is called latex.

人们从胶树上获取天然胶，乳状液体，称为乳胶。

Today, the world needs so much rubber that we use both natural and artificial rubber in large amounts.

今天，世界需要如此多的胶，以至于我们大量使用天然胶和人造胶。

The company makes these from latex, a mixture of water and natural rubber tapped from the bark of rubber trees.

该公司用乳胶制成这些产品，乳胶是水和从胶树皮中取出的天然胶的混合物。

The Cranfield team are working with Levidian and others to produce graphene-infused natural rubber aerospace balloons to operate at altitudes of 30km.

克兰菲尔德团队正在与Levidian和其他人合作，生产注入石墨烯的天然胶航空航天气球，以在30公里的高度运行。

Lonee Smith is 35 years old. She is a student at the adult literacy school at the Firestone Liberia Natural Rubber Company in Margibi County.

罗妮·史密斯今年 35 岁。 她是马吉比县费尔斯通利比里亚天然胶公司成人扫盲学校的一名学生。

They are more sustainable than nitrile gloves because natural rubber absorbs carbon dioxide rather than producing it, and they should biodegrade in about a year.

它们比丁腈手套更具可持续性， 因为天然胶吸收二氧化碳而不是产生二氧化碳，并且它们应该在大约一年内生物降解。

When we press a piece of clay out of shape, it does not spring back to its old shape again as a ball made of leather or of india-rubber does.

我们把一块粘土捏得变形之后，粘土不会弹回原来的形状，而皮子或者天然胶做的球，就可以弹回原来的形状。