伴有小泡性肺换气不足
Extreme obesity with alveolar hypoventilation
备用不足期望值
expected reserve not supplied
比上不足比下有余
can pass muster
fall short of the best but be better than the worst
标准电源电压不足时的印刷电路板
normal source undervoltage pc card
禀赋不足
insufficiency of natural endowment