Rubythroat
n. =ruby-throated humming-bird
🗣️ 情景例句
Tonight, it's my treat.
今天晚上， 我来请客。
I think his fish is a little bigger than mine.
他的鱼似乎比我的大了一点。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）