specify
/ˈspesɪfaɪ; `spɛsəˌfaɪ/ v
(pt, pp -fied) [Tn, Tf, Tw]
(esp fml 尤作文雅语) state or name clearly and definitely (details, materials, etc) 确切说明（细节、 材料等）; 明确规定; 详述
The contract specifies red tiles, not slates, for the roof. 合同中规定屋顶要用红瓦而不用石板瓦.
The regulations specify that you may use a dictionary in the examination. 规则中指明考试时可以用词典.