In nature, itching and scratching help animals get rid of parasites, plant material, or other unwanted baggage.

事实上，骚痒和抓挠帮助动物去掉寄生虫、植物体或其它不想要的垃圾。

If you are arriving from overseas, bring no food, animal or plant material into the country.

如果你是从海外来的，不要带任何食物、动物或植物进入这个国家。

A biofuel in general is fuel developed from plant material.

总体上来讲，生物燃料是来自于植物的燃料。

Heat can soften the plant material and help release the nutrients.

高温可以软化植物物质，帮助释放出营养物质。

Safely operate plant material and handle equipment as required.

按规定安全操作及搬运材料和设备。