Serenest
serene（沉静的, 宁静的, 安宁的）的最高级形式
🗣️ 情景例句
It's on the house.
这是免费的。
Relax. You can count on me.
放一百二十个心吧。
as the wave leaves the particles behind back to its starting point again.
当波浪把微粒留在身后时又回到出发点。