复数： seventeens

A thousand kilograms of recycled paper saves seventeen trees !

一千公斤的再生纸可以节约十七棵树！

She had seventeen children and two of them died .

她有十七个孩子，其中两个夭折了。

I sold your father that house seventeen years ago .

十七年前我把那栋房子卖给你父亲的

Try to imagine exactly seventeen balloons in your head , but without counting them .

试想你的头脑里正好有十七只气球，但不计数。

You wouldn 't match seventeen balloons to seventeen spools by sight alone .

你不会仅凭目测将十七气球和十七个线轴相匹配。