Common indoor plants may prove to be a valuable weapon in the fight against rising levels of indoor air pollution.

普通室内盆栽植物可能是很有价值的武器，可以用来对付日益严重的室内空气污染。

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To the extent that this fear can discourage traders from buying oil, the president may have a weak, blunt, but not altogether futile weapon against ever-rising prices that does not require lifting a finger.

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