The trade surplus leads to large inflows of foreign currency, which is bought up by the central bank in order to hold down the exchange rate.
贸易顺差使得大量的外资流入，这些都是央行买来作为压低汇率之用的。
2
And economists said the fact that China had bought more Treasury bonds does not mean it has stopped diversifying its foreignexchange reserve portfolio.
而且，经济学家说中国增持美国国债的事实不表示中国停止多样化其外汇储备的策略。
3
The rapid growth in China's foreign-exchange reserves means China's central bank has bought huge Numbers of US Treasury notes and other foreign currencies to keep down the value of the yuan.