他们放一个一端打开的箱子，让螃蟹爬进去。箱子有底但没有盖。
They put a box with one side open for the crabs to walk in. it has a base but no lid.
安装1、取掉法兰端两边的保护盖，在阀完全打开的状态下进行冲洗清洁。
The installation 1, Qudiao flange end of the Flange-connection fixed ball valve protective cover on both sides, in the valve fully open state to wash clean.
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