A tiny wire is threaded through a vein to the heart.

一根细金属丝从静脉里穿到心脏。

《牛津词典》

A blood clot in a vein is called a venous thromboembolism (or VTE).

静脉中的血凝被称为静脉血栓(或者vte)。

youdao

Here you can even make out a vein on the hand of the twin in the foreground.

在这里你甚至可以清晰辨认出画面前方这个双胞胎胎儿手上的一根血管。

youdao

During an infusion, stem cells enter the body through a vein leading back to the heart.

VOA: special.2011.02.01

What America do we see? I'm going to look back to a passage I talked about in a different vein last time, on 26 and 27, just for one quick example.

看到什么了呢？，我们看到了什么样的美国？，我想回到,上一次讲另一个脉络时讲到的段落，在26到27页。

耶鲁公开课 - 1945年后的美国小说课程节选

Say Heav'nly Muse, shall not thy sacred vein Afford a present to the Infant God?

天上的神啊，你那神妙的天才,何不献上贡品给这神圣的婴孩？

耶鲁公开课 - 弥尔顿课程节选

Photodynamic therapy involves the injection of a light-sensitive medicine called verteporfin into a vein in the arm.

BBC: Age-related macular degeneration

Ninety-two people had the drug injected into a vein, while another 93 were injected with salty water.

BBC: Drug 'may prevent stroke damage'

On 15 September, the execution of Romell Broom was abandoned after Ohio officials failed to find a vein.

BBC: Ohio governor delays executions