Pregnancy wasn't all plain sailing and once again there were problems.

怀孕并非一帆风顺，又一次出现了若干问题。

The operation was plain sailing.

手术进行得顺利。

But it won't be all plain sailing.

但这将不会都是一帆风顺的。

Life is never plain sailing.

生活从未是一帆风顺。

The project will not be plain sailing.

这个项目不会是一帆风顺的。