The Prime Minister is expected to call a crunch meeting on Monday.预计首相将于周一召开紧急会议。She heard the crunch of tires on the gravel driveway.她听到轮胎轧过石子铺成的车道，发出嘎吱声。Tomorrow, though, is the crunch.明天可就是紧要关头了。...
Hypoid gear transmission is the most complicated transmission. The parameters of ma - chinking are hard to cakulate.准双曲面齿轮是齿轮传动中最复杂的, 其工艺锥参数和加工调整计算都涉及两个相错圆锥的相切接触条件.Fixtures are generally mechanical devices used to assist...