检查液压油缸的动作与密封，需要时更换密封件。
Check hydraulic cylinder operation and seal, replace seal if necessary.
当你拥有一个家时，里面的东西，迟早会打破或需要更换。
When you own a home, something is bound to break or need replacing.
当它们成长时。它们需要更换硬壳若干次。
They need to change their hard shells a few times as they grow.
在备份到硬盘时不需要磁带更换人。
A tape changer is not required when backing up to a hard disk.
在备份到硬盘时不需要磁带更换人。
A tape changer is not required when backing up to a hard disk.
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