泵是自我启动式的，可以进行空转，并不带来任何的损耗，非常适合于泥浆和胶黏性液体，不带有阀门和密封。

According to Barnant, the pumps are self-priming, can operate dry without damage, are suitable for slurries and viscous liquids, and contain no valves or seals.

youdao

这张旧邮票的背面没黏性了， 我得用胶把它粘在信封上。

This old stamp isn't sticky any more; I shall have to gum it down onto the envelope.

youdao