1. But optimists see the current problems of expanding cities as merely part of an evolutionary process.
    但是乐观主义者认为，现在城市膨胀造成的问题只不过是发展过程中的自然现象。

2. But the ratio is even greater among active women, affecting up to 80 percent of female endurance athletes.
    而这一比例在积极锻炼的妇女中数值更高，女耐力运动员中缺铁的则高达80%。

3. By measuring how closely current populations are related, the authors trace the routes by which early humans migrated around the earth.
    通过测定当前人类种群间的亲缘关系，作者们弄清了地球上早期人类迁移的路线。

4. We were rowing against the current.
    我们逆水划船.

5. We divided it in the ratio of 3:1.
    我们按照三比一的比例将它分开。

6. Wires transmit an electric current.
    电线传导电流.

7. When anyone opens a current account at a bank, he is lending the bank money, repayment of which he may demand at any time, either in cash or by drawing a cheque in favour of another person.
    任何人在银行开一个活期账户，就等于把钱借给了银行。这笔钱他可以随时提取，提取的方式可以是取现金，也可以是开一张以他人为收款人的支票。

8. The current is strongest in the middle of the river.
    河中心的水流最急.

9. They throw a holly wreath into the current in the winter.
    在冬季，他们向河里扔一个常青树的花环。

10. They plunged into the lake, and after loading their gear on an inflatable rubber dinghy, let the current carry them to the other side.
    他们跳入湖中，把各种器具装上一只充气的橡皮艇，听任水流将他们带往对岸。

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