抗病毒治疗几乎无效。

Antiviral therapy has little beneficial effects.

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得出的结论是，机械式变极化器在反气象干扰中几乎无效。

Result obtained by this paper is that the mechanical polarization converter is invalid in anti weather-jam.

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杀虫剂35%甲基硫环磷乳油叶面喷施对跳甲的防效为79.2%，对地下害虫几乎无效。

The control effect of pesticide 35% phosfolan-methyl EC for mangold flea beetle was 79.2%, but it couldn't control subterranean insect pests.

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