Points for daily maintenance and periodic maintenance.
分为日常保养和阶段性保养。
We rushed to the football court, _________________ a sign on which "was written "Periodic Maintenance".
我们冲进足球场，结果只看见球场上一块牌子上写着“定期维修” 。
We rushed to the football court, _________________ a sign on which "was written "Periodic Maintenance".
我们冲进足球场，结果只看见球场上一块牌子上写着“定期维修” 。
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