同根派生 英汉例句She glanced quickly around the only room and plumped down on the only available chair.她扫视了一下拥挤的房间，扑通一声坐在了唯一的一把空椅子上。She plumped down the heavy trunk and sat on a stone bench for a rest.她吃力地把那只沉重的箱子放下来，然后坐在一张石凳上休息一下。