Discuss pollution with your child, emphasizing how nice a clean street, lawn, or park looks.

　　和孩子討論污染問題，強調清潔的街道、草地或公園有多么美麗。

　　Kitchens that are not kept clean may be closed for use.

　　未保持清潔的廚房可能會停止使用。

　　I'm always having to clean up after the children.

　　孩子們離開以后，我總得打掃一番。

　　I dare say that the computer would provide a clear answer to that

　　想必計算機能就其給出一個清楚的答案。

　　Whatever its obscurities, the poem was clear on at least one count.

　　這首詩再怎么晦澀，至少有一點是清楚的。

　　It is not clear what they want us to do.

　　我們不肯定他們要我們做什么。