a. (usually followed by `to') not having the necessary means or skill or know-how
s. (usually followed by `to') lacking necessary physical or mental ability
常见例句
1
n a disorder in which a lesion to the central nervous system leaves you unable to formulate a statement or to express yourself in an organized manner
2
a serve that the receiver is unable to reach v
3
safeguards an area extending from Norway to Turkey n a serve that the receiver is unable to reach v succeed at easily v score an ace against v play (a hole) in one stroke v serve an ace against (someone)
4
uncertain or unable to decide about what course to follow
