shelf的复数形式

　　The shelf is about a metre long ─ well, 98cm, to be precise.

　　架子长约一米。嗯，精确地说，是98厘米。

　　There was a clutter of bottles and tubes on the shelf.

　　架子上胡乱堆满了瓶子和管子。

　　Put the book back on the shelf.

　　把书放回书架上。