You may clean it after school.
你可以在放学后再打扫。
You may clean your room after dinner.
你可以晚饭后打扫你的房间。
If the guest answers your knock, ask when you may clean the room.
如果客人回应，向客人询问可以进行客房服务的时间。
If the air filter 18 is fixed, force-fit or permanently secured in the filter box 22 or housing 12, a user may clean the upstream-face of the air filter 18 using a vacuum or other cleaning methods.
如果空气过滤器18是固定的，过盈配合或者被永久固定在过滤器盒22或外壳12内，则用户可以使用真空清洁或其他清洁方法清洁空气过滤器18的上游表面。
If the air filter 18 is fixed, force-fit or permanently secured in the filter box 22 or housing 12, a user may clean the upstream-face of the air filter 18 using a vacuum or other cleaning methods.
如果空气过滤器18是固定的，过盈配合或者被永久固定在过滤器盒22或外壳12内，则用户可以使用真空清洁或其他清洁方法清洁空气过滤器18的上游表面。
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