clean
adj.洁净的;干净的;爱干净的;爱整洁的;无有害物的;无污染的
v.除去…的灰尘;使…干净;打扫;变干净;清除内脏
adv.(行动)彻底地，完全地
n.打扫;清扫
The law would encourage companies to switch from coal to cleaner fuels
该法律将鼓励企业转而使用比煤更加清洁的能源。
The beach was the cleanest and most beautiful they had ever seen.
那儿的海滩是他们所见过的最干净、最漂亮的海滩；
Maybe it is the cleanest seas and rivers in the world.
可能是世界上最干净的海和河了吧。
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