这些瓶子可以退还用于回收。

These bottles are ___returnable for recycling.

这些塑料箱是可退还的，使用后请归还。

These plastic crates are ___returnable, please return them after use.

这位选手的击球角度太刁钻，几乎无法回击。

The player's shot was so angled that it was hardly ___returnable.