Current methods such as single-focus glasses, bifocal glasses and progressive additional lens are the most widely used for correction of presbyopia.

Occasionally, children who have crossed eyes may need to have bifocals to help control the crossing.

偶尔有内斜视的孩子会需要双光镜来控制内斜。

Based on the Collins formula, the propagation expression of astigmatic Cosh-Gaussian beams passing through a bifocal lens system is derived.

基于Collins公式，推导了有像散双曲余弦高斯光束通过双焦透镜系统后的解析传输公式，分析了该光束轴上光强分布和焦移。

New-Rural-Community Project, Urbanization, and Migrated Population: A Bifocal Perspective of the "Three Rurals" Issue in China

新农村建设、城镇化进程与流动人口问题&我国三农问题的双重视野、双向效应和双轨路径

I rang the bell, and a geeky, middle-aged man in bifocals stuck his head around the door.

我按响了门铃，一个头上架着变焦眼镜，看起来一付科技痴汉模样的中年男子从门后探出头来。

Multilevel Feature Detection Algorithm Based on Bifocal Monocular Stereo Vision

基于双焦单目立体视觉的多层次特征检测算法

The effects of right ventricular bifocal pacing on cardiac function and QRS duration

右室单双部位起搏对心功能和QRS宽度的影响

The study of the acute hemodynamic effects of right ventricular bifocal pacing

右室双部位起搏的急性血流动力学研究

Starting from Collins integral, the focusing characteristics of Gaussian beams passing through a bifocal lens are studied.

从Collins公式出发，研究了高斯光束通过双焦透镜后的聚焦特性。

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

He brought us bifocals and the lightning rod,

他发明了双光眼镜和避雷针，

Calculation of minimum central thickness of fused-bifocals

论熔合双光镜最小中心厚度的计算方法

The oceanfront terrace, eight meters by four, has a glass balustrade and bifold doors.

面朝大海的露台长八米，宽四米，带有一圈玻璃栏杆和一道双开门。

European Bifold Patio Doors have special open way. It can make internal as external and it is ideal doors for wide opened wall.

欧式折叠门具有独特的开启方式，能在瞬间将室内变成室外（启）是理想的大型通风采光门窗。

When the tube is biforked, the additional turbulent flow will be produced, which will improve the flame transmission speed in gas explosion.

管道分叉时，产生附加湍流，使瓦斯爆炸过程中火焰的传播速度迅速提高。

Help you realize perfect show hair to long for, to biforked hair end says good-bye.

帮助你实现完美秀发渴求，对分叉的发尾说再见。

With the development of Computer Aided Quality Control System, significance test, as a necessary tool of quality management and quality control, is faced with the problem of program.

随着计算机辅助质量控制系统的发展，显著性检验作为质量管理和质量控制中的必备工具，也面临着程序化的问题。

There is no problem if the program uses some other stream.

如果程序使用的是某些其他流，那么也不会有任何问题。

In traditional OOP programming, as the requirement space is N-dimensional while the implementation space is one-dimensional, this terrible mapping leads to the crosscutting concern code's tangling problem in program development, which seriously affects the quality of software.

在传统的OOP编程中，由于需求空间是N维而实现空间是一维的，导致了软件开发中横切关注点的代码纠缠问题，严重影响了软件的质量。

Termination preserving problem in program transformation

程序转换中的终止性保持问题

The students cannot achieve mastery through a comprehensive study, cannot use the knowledge neatly, and cannot use to program design to solve practical problems and so on, which has become a problem of program design teaching.

学生不会灵活运用所学知识，不能用程序设计解决现实问题等等，已经成了程序设计课程教学的难题。