Wally was laughing fit to burst.沃利快要笑破肚皮了.He carried on telling a joke, laughing his head off.他继续讲笑话，自己笑得前仰后合。When I stepped into her box, Marguerite was laughing uproariously.当我走进包厢的时候, 玛格丽特放声大笑.We all just cracked up l...
Currency-conversion costs remain one of the biggest obstacles to cross-border trade.货币兑换成本仍是跨境贸易的最大障碍之一。Creative people are usually very determined and thrive on overcoming obstacles.富有创造力的人一般都意志非常坚定，能不断克服困难，事业蒸蒸日上。To su...
这一点是指其身体上的发光斑或发光点.This may show as luminescent blotches or spots on the body.我们将它称为光束的 “ 光斑尺寸 ”.We will consequently refer to it as the beam'spot size ".如果孔是圆形的, 那么在屏幕上出现一圆形光斑.If the aperture is circular, a circular...