But those who backclearance enterprise can compare to the early through.
但是那些进行提前清关的企业能够比较早地通过。
2
The forming of flank of conical twist drill was studied and mathematical model of twist drill tine was founded in order to get formula of backclearance.
研究了锥面麻花钻后刀面的成型，建立了钻尖的数学模型，由此确定了后角的计算公式。
3
One year later he came back to the office with an odd request. He was applying to become a driver and needed my clearance, which was a formality.