I know him only by sight.

我只是见面会认识他。

youdao

Eg: 1 I know Mrs Hill by sight, but have never met her.

我见面认得希尔夫人，但是从来没人给我们引见过。

youdao

Tell by sight how each variable received its present value.

预先断定每个变量如何获得其当前值。

youdao

Although face masks, which have become a common sight in Mexico City, are worn by only a few people on the streets of Juarez,pharmacies say they are doing a brisk business selling them.

VOA: standard.2009.04.30

The power to know is our ability to recognize, by sight, members of the same polis or city.

求知的能力,是我们透过双眼辨别，同一城邦或城市成员的能力。

耶鲁公开课 - 政治哲学导论课程节选

Mathematically, it's done by taking the expression for R and differentiating everything in sight that can be differentiated as vector t.

从数学上看是这样的,写出 R 的表达式,并对所有可以进行矢量微分的部分,对时间 t 求微商

耶鲁公开课 - 基础物理课程节选

The reason, believes Andy Sharp, a local copper, is that so many people know each other by sight.

ECONOMIST: Poor whites

The birds usually forage by sight during the day and less efficiently at night by locating prey by touch using their bills.

BBC: Grangemouth and Longannet lights help birds feed at night

It can recognize up to three people by voice and one by sight, and reacts with visible pleasure to the sight or sound of its owner.

FORBES: Aibo