He carried on telling a joke, laughing his head off.他继续讲笑话，自己笑得前仰后合。They dragged him to the village square and chopped his head off.他们将他拖到村里的广场上，把他的头砍了下来。I laughed my head off when I heard of his discomfiture.听到别人说起他的狼狈相...
The systems are getting smaller and using lower voltages.这些系统变得更小，使用的电压也更低。The exact voltages used depend on the local supply.具体电压要视地区供电情况而定.However, high breakdown voltages necessarily need high - resistivity material.但...
International investors have become jittery about the country's economy.国际投资者已对该国的经济状况感到紧张不安。Investors can apply for a package of shares at a set price.投资者可以申购固定价格的股票组合。Investors would do well to take a look at the ...