钻头必须缓慢转动，以保证钻孔平整光滑。The drill should be slowly rotated to ensure a clean hole.打钻和提钻时要保持钻头平稳。Keep the drill steady while it ascends and descends.你得拆开这个钻头。You'll have to disassemble the drill....
A company of guardsmen swung past.一队卫兵整齐地跑过去.It took ten guardsmen to overpower him...10名警卫一起才将他制服。It took ten guardsmen to overpower him.10名警卫一起才将他制服。The National Guardsmen were sent out to trench.国民卫队被派去挖战壕....