A concave lens causes rays to diverge as though they are coming from a focal point.

Some are flared-that is, thicker at the rim than the center, like a concave lens.

有些呈喇叭形 ─ ─即边缘较中心厚, 类似凹透镜.

I examined three key technical properties of this proposed concave-mirror projector.

我检验了凹面镜投射的三项关键技术特性.

And there also was a concavity in his car's front wing ( fender ).

而且,他的前 挡板 上还凹陷了好大一块撞痕.

Edema skin tight, shiny, pale or light red color, soft texture, it is concavity.

水肿处皮肤紧张, 发亮, 色苍白或淡红, 质地软, 无可凹性.

The degree of concavity varies between species as does the size.

凹度因物种而异,大小也各不相同.

Once the concavity was filled further growth could not take place.

一旦凹陷填满,就不可能继续生长.

Push the handle gently until the concavo convex parts of both clutches occlude automatically.

用手轻推手柄待两个离合体的凸凹处重合后便会自行咬合.

Robert could not conceal his relief.

罗伯特无法掩饰自己如释重负的心情。

It took some effort to conceal her relief.

她好不容易才掩饰住宽慰的心情。

Frances decided to conceal the machine behind a hinged panel.

弗朗西斯决定把机器藏在带铰链的嵌板的后面。

He couldn't conceal his envy of me.

他掩饰不住对我的忌妒。

He could hardly conceal his joy at his departure.

他几乎掩饰不住临行时的喜悦.

He made no attempt to conceal his smirk.

他毫不掩饰自鸣得意的笑容.

He tried to conceal his instinctive revulsion at the idea.

他试图饰盖自己对这一想法本能的厌恶.

I did not conceal anything from him.

我对他什么也不隐瞒.

He's a fool who cannot conceal his wisdom.

不懂得掩藏自己智慧的人是傻子.

Some of the females had to conceal the ravages of vice and dissipation coatingpowder and paint.

有些女人涂脂抹粉想掩盖那由于作恶多端和行为放荡而留下的痕迹.

He who tries to conceal his fault for fear of criticism will sink deeper and deeper in the quagmire of errors.

讳疾忌医的人,错误越陷越深.

The earth will disclose the blood shed upon her ; she will conceal her slain no longer.

地也必露出其中的血, 不再掩盖被杀的人.

Fine clothes could not conceal the girl's homeliness.

华丽的衣服并不能掩盖这个女孩的寻常容貌.