Highways are constructed in China at a rate exceeding 4,000 kilometers a year, long enough to span the entire United States.

今天在中国，高速公路每年建造四千多公里，足以横跨整个美国。

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Highways are constructed in China at a rate exceeding 4, 000 kilometers a year, long enough to span the entire United States.

今天在中国，高速公路每年建造四千多公里，足以横跨整个美国。

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The exchange rate is passed in from outside the class. It is not constructed inside the class.

汇率是从这个类之外传递进来的，并不是在类内部构造的。

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Dr William Van't Hoff, a consultant paediatrician and a spokesman for the Royal College of Paediatrics and Child Health, says this is an important, well constructed study that demonstrates "a high and unacceptable rate of adverse events" associated with the use of complementary and alternative medicine (CAM).

BBC: Alternative remedies 'dangerous' for kids says report

He is creating computer simulations to model the liver, so optimum channel size, flow rate and density of cells can be calculated as accurately as possible, before the artificial liver is constructed in the laboratory.

BBC: NEWS | Health | Glass liver may aid disease fight