?? 詞語組成解析
越桔屬
??? 情景例句
Everyone is expected to stick to the rules.
每個人都要遵守規(guī)則。
How are you doing these days?
這些日子你怎么樣？
a wave length (the horizontal distance between two wave crests),
波長（兩個浪峰間的水平距離）