收集贝壳（collecting是collect的现在进行时）

collecting tubules───集合小管

collecting boxes───收集箱

collecting tins───收集罐头

collecting tubule───收集小管；[解剖]集合小管

collect calls───对方付费电话；拨打对方付费的电话

collecting bank───代收行，代收银行

collecting box───接受器；收集箱

collecting tin───收集锡

collecting up───收集

How long has she been collecting shells?───她已经收集贝壳多长时间了？

People are collecting shells.───人们正在捡贝壳。

Jane's collecting shells on the beach.───简正在海边收集贝壳。

The children were collecting shells on the beach.

• collecting shells
• collecting ants specimen