be plain sailing to be very easy to do or achieve一帆风顺，非常顺利:•If you can answer the first question, the rest of the test should be plain sailing.如果你能回答测验的第一个问题，其余的问题就是小菜一碟了。be plain ˈsailing(US alsobe clear ˈsailing)to be simple and free from trouble顺利；一帆风顺 |