1、毫无障碍
... explanation: reveal a secret 泄漏秘密 The coast is clear 毫无障碍；安全 All set 准备妥当 ...
2、安全
... explanation: reveal a secret 泄漏秘密 The coast is clear 毫无障碍；安全 All set 准备妥当 ...
3、道路畅通
...the clock round 连续一整天The coast is clear 道路畅通The coat fits 衣服正合身 ...
4、危险已过
危险已过(the coast is clear), 此释义来源于网络辞典。