1.
yellow-flowered perennial common in fields and waste places but a weed in rangelands.
通常长在农田和荒地上的一种开黄花的多年生植物，但在牧场上是一种有害杂草。
2.
weedy Eurasian plant often a pest in grain fields.
一种杂草类的欧亚植物，通常对谷物的种植有害。
3.
Studies on Controlling Pest and Weeds by Integrated Rice-Duck Farming Technology
有机水稻生产稻鸭共作防治杂草、害虫的研究
4.
eliminating ill weeds
消灭危害性大的杂草
5.
Kill off weeds, insects, rats
灭除杂草、害虫、老鼠
6.
cosmopolitan family of small herbs and a few shrubs; most are troublesome weeds.
广域小型草本和一些灌木植物科；大多数是有害的杂草。
7.
Harm of Lawn Weeds and Research on Biological Control
草坪杂草的危害及生物防除研究进展
8.
European thistle naturalized in United States and Canada where it is a pernicious weed.
美国和加拿大已引入的欧洲蓟，它是一种有害的杂草。
9.
low-growing weedy grass with spikelets along the leaf stems.
矮杂草，沿叶柄长有小穗。
10.
A bit of weeding wouldn't hurt .
有一点杂草也无所谓.
11.
widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity.
广泛分布欧洲的杂草，有黄色类似雏菊的花；牲畜大量食用会有毒害作用。
12.
grasses with creeping stems that root freely; a pest in lawns.
有匍匐茎，生根自由的草类；一种草坪中的有害草。
13.
"Essential tasks include soil maintenance, water regulation, control of weeds, and protection of plants from pests and diseases."
园艺的基本工作有土壤保持、杂草控制,以及保护植物不要染上病虫害等。
14.
Goats were many and grass scarce, so there were not many weeds in the wheat fields.
羊多草缺，所以麦地里没有杂草。
15.
Some other herbicides are not effective against as many as seventy kinds of weeds.
一些除草剂对70种杂草都没有效力。
16.
Weed control and timing of treatment to avoid weed penalty.
杂草控制及适时处理，以防止其蔓延危害作物。
17.
On grasses, injury is usually confined to areas between the veins.
杂草中危害通常仅限于叶脉间的条状区域。
18.
Harmfulness of exotic weeds in China and for their management
外来杂草在我国的危害性及其管理对策