If you specify something, you give information about what is required or should happen in a certain situation. 明确要求
verb [vt. 及物动词]指定;详细说明(specify 的过去分词)
If you specify what should happen or be done, you explain it in an exact and detailed way. 具体说明He agreed to pay at specified rates per diem. 他同意每天按规定的数额付款。