往来, 收缩和膨胀, 发生的事的英文

come-and-go

• 往来:    come and go; to an ...
• 收缩:    contract; shrink
• 和:    mix; blend
• 膨胀:    expand; swell; dil ...
• 发生:    happen; occur; tak ...
• 的:    4次方是 The fourth po ...