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Both sides of the river can be explored on this
circular
walk. 沿着这条环行线路走一圈，河的两边都可以看到。
Hot water
circulates
through the heating system. 热水在供暖系统中循环。
Police have warned that there are a lot of fake £50 notes in
circulation
. 警方提醒，有大量50英镑面额的假钞在流通。
Under no
circumstances
should you approach the man. 你绝不能靠近那个人。
In an ideal world we would be
recycling
and reusing everything. 理想状态是，我们能回收并再利用所有东西。