n. (u.)不可數名詞一帆風順After the initial difficulties, it was plain sailing to complete the project.
n. (u.)不可數名詞順風航行With a steady wind and calm seas, the voyage was plain sailing.
adj.形容詞容易的The rest of the journey was plain sailing after we fixed the engine.
adj.形容詞預計容易Once we get past this hurdle, it should be plain sailing from here on out.