drop-in的用法和樣例：
例句
用作名詞 (n.)
- Some of the people were drop-ins who had no real interest in the case.
有些人是順便來聽聽的，對這個案子并無真正的興趣。
詞匯搭配
- a drop in the ocean 滄海一粟
- drop in 順便走訪(某人)...
- drop something in someone's lap 把責任推諉給某人,把...
- a drop in the bucket 滄海一粟
- in drop 內曲下墜球
- have a drop in one's eye 有點醉意
- drop in pressure 壓力降低
- drop in delivery 降低泵的排量...
- drop in price 跌價
- drop in pressure head 壓強水頭差降...
- drop in leaf 活動翻板
- drop in temperature 降溫
- drop in level 高程差
- drop in on 非正式訪問
- drop in at 光臨
- bit drop-in 信息混入
