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（单词翻译）
American superweeds
Vocabulary
harvesting
gathering
herbicides
toxic chemicals used to kill weeds
to stem
to stop or restrict
resistance
ability of an organism to protect itself
seeking
applying for
a component
a part of
defoliant
chemical that removes the leaves from trees and plants
extensively
over a wide area
get the go-ahead
be allowed to start
incorporate
include
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