拔除下牙时,病人的下颌应与术者的______等高,病人头部应较拔上牙时更为后仰,使张大口时,下颌牙合平面与______平行,便于器械操作。术者在拔下前牙时,站立于病人______方;拔其他下牙时站立于病人______方。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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