Tragon
角豆樹膠
??? 情景例句
I've been studying all day, and I'm sick and tired of it.
我學(xué)了一天，現(xiàn)在感到厭倦。
I know you are all busy.
我知道大家都很忙
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走過一個波長所需的時間）。