All transport operations, whether by sea, rail or road, are closely monitored at all times.
所有的交通活动,无论是通过海路、铁路还是公路,都时刻受到密切监视。
《柯林斯高阶英汉双解学习词典》
If you had never seen a telly ad, you would be all at sea with popular culture.
如果你从没看过电视广告,你就搞不懂什么是大众文化。
《柯林斯高阶英汉双解学习词典》
