... a waste of 浪费 be under close watch 被严密监视 keep (a) watch 值班,守望 ...
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be under close watch
严密监视
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Then the population could be screened for Loa Loa, and kept under close watch while the river blindness drug was administered.
BBC: Danger worms tracked from space
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