bifocal lens

Focusing properties of Gaussian beams passing through a bifocal lens;

高斯光束通过双焦透镜的聚焦特性

It's definitely a modern-day bifocal lens.

它绝对是现代的双焦镜片

I know. And bifocals weren't invented until the mid-1 700s.

我知道,而且双焦镜片是在 1700年中才发明出来的

flat-top plastic bifocal

平顶塑料双焦点透镜

He focused his binoculars on the bird.

他把双筒远镜的焦点对准在那只鸟上。

The field glasses adjust with a screw.

双筒望远镜是用一个旋钮调节焦距的。

He took out the binoculars and adjusted the focus.

他取出双筒望远镜并调整了焦距。

autofocus zoom lens

自动聚焦变焦距镜头

Methods: Laser scanning confocal microscope combined with immunohistochemical double labeling methods were used.

方法应用激光共聚焦显微镜结合免疫组织化学双标技术。

a Binocular auto focus camera with marvelous effects, a masterpiece, is easy to handle.

精心杰作双镜头自动聚焦相机使用简便，效果极佳。

Propagation Properties of Partially Coherent Flat-topped Beam Passing through Astigmatic Lens;

部分相干平顶光束经过双焦距薄透镜的传输特性研究

front cell focusing

【光】前置镜组封焦

variable focal length (cylindrical) lens

变焦(距)(圆柱)透镜

long focus lens

长焦距（望远）镜头

manual zoom lens

(镜头)手控可变焦距透镜

Eyeglasses having trifocal lenses.

有三焦距镜片的眼镜

binocular microscope

双目显微镜,双筒显微镜

A binocular or field glass.

双目镜，双筒望远镜

Propagation properties of partially polarized,partially coherent vectorial cosh-Gaussian beams through bifocal lens

部分相干部分偏振矢量双曲余弦-高斯光束通过双焦透镜的传输特性