Quadripod
平底四角锥体
🗣️ 情景例句
She's an easy-going teacher.
她是位随和的老师。
Don't be anxious if I'm late.
如果我回来晚些也不必担忧。
it would be up and down, to and for and from side to side.
呈现出上上下下、来来回回、左左右右3种性质的运动。