有迹象表明，中国将允许国民购买外国资产，这将是减轻国内资产价格上升压力和人民币升值压力的一种明智方法。

There are signs that China will allow its citizens to buy foreign assets, which would be a sensible way to relieve pressure on domestic assets and on the currency.

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文中介绍了IGBT升压与降压式三相高频SPWM整流器的基本工作原理和控制方法。

This paper describes the basic working principles and control methods of three-phase high- frequency boost & buck IGBT SPWM rectifiers.

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常用的试验方法为静水试压，即：向封闭的管段充水，然后把管段升压至规定压力，检查是否泄漏。

A common approach is hydrostatic testing-filling a closed pipeline section with water, then pressurizing the line to a specified pressure to check for leaks.

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