当将所有线积分加在一起时，所有内部的线积分都抵消了，只剩下仅需要一次计算的，就是外围边缘部分。

When I sum all of the little line integrals together, all of the inner things cancel out, and the only ones that I go through only once are those that are at the outer most edges.

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然而在罗马条约下，地中海在欧盟仅似一个边缘地带，而不是主要组成部分。

Under the Treaty of Rome, however, the European Union has behaved as if the Med were a frontier, rather than an organising principle.

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这座山被希瓦陨石坑的边缘所包围，从河床到山峰高仅5千米。

This mountain measures five kilometres from sea bed to peak, and is surrounded by Shiva's crater rim.

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