当阀门预备维修时应该订购备用更换套管。

A spare replacement sleeve should be placed on order when this valve is placed in service.

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为避免一项较大的房屋维修费用让你措手不及，要预备至少半年的租金以备不时之需。

To ensure that a major repair doesn't break you, set aside at least six months' worth of expected rent, he says.

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