For them, the mask is concave and rotates in one direction.

对他们来说，面具是凹陷的，并且朝一个方向旋转。

Red blood cells are tiny by concave disc-shaped cells known as erythrocytes.

红细胞很小，被称为红细胞的凹盘状细胞。

Concave mirrors direct the sun to a middle tube to heat an oil solution.

凹面镜将阳光引导到中管，对油溶液进行加热。

I would, I'd be going down concave over.

我会，我会下凹。

You built that big concave glass tower.

你建了座凹面的大玻璃楼。

He flapped across the room, chest concave, shoulders rounded, arms hanging limp, feet wide apart, chin thrust forward.

他拍打着穿过房间，胸部凹陷，肩膀圆润，双臂无力地垂下，双脚分开，下巴向前。

They find a concave branch or  stump and lay their egg there.

他们找到一个凹形的树枝或树桩，并在那里产卵。

There's a concave deformity in the right atrium.

右心房有凹陷形变。

He and his comrade-in-arms worked at a concave concealment.

他与他的战友们在一处凹的隐蔽处工作。

A concave mirror creates an image from this light using a design pioneered in the 17th century, by Sir Isaac Newton.

早在17世纪，艾萨克.牛顿就开创性的利用这个光，让凹透镜产生了一个图像。