smooth sailing 一帆风顺；顺利

【例句】
To be sure, not every project has enjoyed smooth sailing.
可以肯定的是，并不是每一项工程都得到了一帆风顺。

For the first three days I had a headache, after that it was smooth sailing.
前三天我一直头疼来着，但之后就一帆风顺了。