假如第二颗乳牙过早脱落，那摸装上间隙保持器是件要紧的事。
It's very important to make a space maintainer if the second deciduous molar is lost too soon.
传感器可自动调节补充空气以使卷筒纸到表面之间的间隙保持一致。
A sensor automatically adjusts supply air to maintain consistent web-to-surface clearance.
传感器可自动调节补充空气以使卷筒纸到表面之间的间隙保持一致。
A sensor automatically adjusts supply air to maintain consistent web-to-surface clearance.
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