The hair on the face is short and smooth, except for a beard which grows in a narrow line at the back of the jaw.

脸部的毛发短而平顺。除了胡须是生长在下巴后面的一条窄线上。

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Our results are expected to provide a new approach to experiments on realizing ultra-narrow line-width radiations as well as optical clocks.

该论文的研究结果有望为实验上实现超窄线宽光源以及光学原子钟提供一种全新方案。

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This paper puts forward a conception of a non-diffraction structured light (NDSL), which has characteristics such as linear structure, long focal-depth and narrow line-width, etc.

提出了一种无衍射结构光概念，这种光具有线性结构、焦深长、线宽小等特点。

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The summit's closing formal communique walked a narrow line.

NPR: Latin America Summit Ends with No Free-Trade Zone

Some Whitehall press officers in turn worry that they are being forced to cross the narrow line of propriety between propagating the policies of the government of the day and party politics.

ECONOMIST: Struggling for the prince��s ear

Previous on-chip nanofocusing devices were only able to focus light into a narrow line, making them inefficient, whereas Caltech's contraption can be focused in three dimensions, producing a point a few nanometers across, and using half of the light that's sent through.

ENGADGET: Caltech invention focuses light like never before, could bolster next-gen communication platforms