doubling

• The boss wants you would better get upstairs at the double .
  老板叫你你最好赶紧上楼去。
• He doubled back by another road and surprised us ...
  他从另一条路绕回来，突然出现在我们面前。
• Being doubled up on guard isn't so good either .
  弯腰屈背地在这儿放警戒，也不见得就那么好受。
• We shall try to drive them for a while in double harness .
  我们想暂时足跨两个马鞍来考虑问题。
• Ten is the double of five .
  十是五的两倍。
• If sufficient trap is added, it may double the rate .
  如果加入足够的捕捉剂，速度便可增加两倍。
• A double trapezoidal specimen will generate shear debonding .
  双梯形的试样将产生切变脱胶现象。
• This is the double helix .
  这就是双螺旋。
• Had he turned west or doubled back to the north and east ?
  他是向西了，还是急忙转身向北向东了？
• He did a double take when i said i was getting married .
  我告诉他我要结婚了，他半天才恍然大悟。