C.a.
[医] 颈轴的
🗣️ 情景例句
Nervous about the opening tonight?
对今晚开幕感到紧张吗？
Put the shoe on the right foot.
责备应受责备者，表扬应受表扬者。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）