清旦，读音是qīng dàn，汉语词汇，意思是清晨。
一旦完成了，人类基因，即人类蛋白质基因代码，将会变得一清二楚。所有的问题都会得到解答。
When it was complete, so the story went, humanity's genes-the DNA code for all human proteins-would be laid bare and all would be light.
大洋能够自身清除污染，但是某些海域一旦被污染，却没有自身清污能力。
Oceans are able to clean themselves, but certain seas, once they become dirty, are not able to do so.
红蜘蛛是一种刺吸式害虫，一旦发现虫害，可用扫螨净或螨虫清灭杀。
Red spider is a kind of thorn sucks type pest, once discover insect pest, usable sweep mite clean or mite bug is clear destroy kill.
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