upper(lower)dental arch

• 上[下]牙弓

英英释义

名词 upper:

1. the higher of two berths

2. piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot

3. a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression

形容词 upper:

1. the topmost one of two

2. higher in place or position

3. superior in rank or accomplishment