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Some took care of the flowers and bushes, and persuaded people to keep off the grass.

一些人照看鲜花和灌木，劝人们不要践踏草坪。

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Some kinds of fish will keep lakes and water-ways clear by eating water weeds. the Chinese grass carp is one. it eats large amounts of water milfoil and other weeds that grow under the water surface.

有些鱼类能吃掉杂草从而保持湖塘、水道的清洁。中国草鱼即是一例，它能吃掉大量狐尾草之类的长在水面下的杂草。

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Keep the grass cut and lights on is the motto of the program.

NPR: An Achilles' Heel In Charlotte's Housing Market

He played semi-pro football on Pittsburgh fields so devoid of grass they were sprayed with oil to keep the dust from rising.

BBC: How pro football hooked America

Ranchers had planned on using the grass to feed cattle... and the fires also destroyed miles of fences that keep the cattle in.

NPR: Fires Scorch Nebraska Cattle Industry