concave

名词凹面，成凹形

形容词凹的

及物动词使成凹形

1. 凹：此为一般待焊板无铅回焊所常用的有鞍型回焊曲线,各热量差异较小.此 L 型曲线以直线式或稍呈下凹(Concave)为宜,不可出现隆起(Convex)状态,以免板 面过热造成厚板之表层起泡.且此升温线的 2/3 长度处不宜超过 150℃,其余参数同上 29.

2. 凹的：微观经济理论认为,当企业的生产投入集是闭的(closed),单调的(monotonic)且满足自由处置(free disposal)等条件时,如果生产函数关于产量是凹的(concave),那么其对应的成本函数关于产量就是凸的(convex ).

3. 凹形：convex 凸面 向外弯曲.凸面镜是一面镜子,它的反射面是由球或抛物体的外表面 形成的.凸面透镜至少有一面由球的外表面形成.双凸透镜有两个凸面, 故其中心最厚.平凸透镜有一平面和一凸面.凸凹透镜(亦称弯月形透镜) 有一凸面和一凹形(concave)面.

1. 凹的;凹面的
    A surface that is concave curves inwards in the middle.

    e.g. ...a concave stomach.
           凹陷的腹部
    e.g. ...the concave bottom of an empty hair spray container.
           空喷发胶罐凹进去的罐底

1. The Stone Boat is a big concave stone which resembles a boat.

2. The pit hotel is a marvel at home and abroad and the only one of its kind with concave pits.

3. Pleat the jiaozi on one side only, so it gets its traditional concave ingot shape.

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4. Using the sun's rays harnessed in a concave mirror is the traditional way to light the torch.

5. Another example of Yang's " thinking of the user " experience is the vertical concave and convex patterns on the tea set.

6. A distinctive grid represents radiating energy, while the background is concave to suggest an amphitheater.

adj