将“virtually"翻译成中文

But without plants and photosynthetic life, there would be no oxygen, virtually no oxygen in our atmosphere.

不过没有植物和其它光合生物, 大气中就不会有氧气, 事实上连一丁点儿都不会有。

In Japan too where elderly women are highly respected, hormone treatment for menopause is virtually unknown.

日本人对上了年纪的妇女也尊重备至,妇女在更年期接受激素疗法差不多是前所未闻的。