Envelops
n. 包络线；信封（envelop的复数）
🗣️ 情景例句
What time do you usually get up in the morning?
你早上通常几点起床？
Politeness is to do and say the kindest thing in the kindest way.
文雅就是善良地做事，和善地说话。
Any ship that crosses the Pacific is accompanied for many days by the smaller albatross,
任何一艘横度太平洋的轮船都会有一种小信天翁伴随飞行许多天。