齿条千斤顶：采用齿条作为刚性顶举件的千斤顶。
Rack hoisting jack: Uses the rack to go against as the rigidity lifts a hoisting jack.
螺旋千斤顶：采用螺杆或由螺杆推动的升降套筒作为刚性顶举件的千斤顶。
Screw jack: Uses the screw rod or the fluctuation sleeve which impels by the screw rod goes against as the rigidity lifts a hoisting jack.
他说，事后看来，中国在恰逢美元触顶之时宣布增加人民币兑美元的弹性，实为妙举。
'in hindsight, it was a masterstroke for China to announce greater yuan flexibility against the dollar right about when the dollar had peaked,' he says.
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