a clear coast

• 平静无事,毫无障碍

a clear coast的用法和样例：

例句

1. The conference came off without a hitch.
   会议毫无障碍地结束了。
2. You can come out now, the coast is clear.
   你现在可以出来了，没有危险了。
3. It's safe to take a mild sedative.
   服用药性不强的镇定剂没有危险。