图钉

I press the thumbtack into the board with thumb.

我用大拇指将图钉按在木板上。

He pinned up the notice with a thumbtack.

他用图钉将通知挂了起来。

He affixed the picture to the wall with a thumbtack.

他用图钉把图片钉到墙上。不适合

Without them, it'd be a facelessstory—with them, it's the thumbtack that pins it down for us toremember.

少了它们，故事变得苍白无力——而有了它们，故事就像钉在脑海的图钉一样，让我们难以忘怀。

Without them, it'd be a faceless story—with them, it's the thumbtack that pins it down for us to remember.

少了它们，故事变得苍白无力——而有了它们，故事就像钉在脑海的图钉一样，让我们难以忘怀。

He affix ed the picture to the wall with a thumbtack.

他用图钉把图片钉到墙上。

Ralph: I just ate a thumbtack!

我只吃一个图钉！

You'll push a thumbtack into the wall, or pick up a paper clip, or just turn quickly, and you'll think that that simple movement caused your pain.

可能你只是将图钉钉在墙上，或捡起纸屑，或只是突然的转动身体，这些简单的动作都会导致疼痛。

"It was my big hope that people would get right away and at least put a thumbtack on the map as far as our location,\\\" Buck said.

"我最大的愿望是希望人们能够立即收到，哪怕在我们所处地方的地图上钉一枚图钉也好。" buck 说。

Ouch!cried the principal.there is a thumbtack in this chair.

"哎哟，"校长叫道，"这把椅子上有颗图钉。"

Compared the voltage negative feedback wire-feeding speed regulation system supported by current positive feedback with the rotational speed negative feedback regulation system, the equivalent condition of the two systems is obtained. Then, a wire-feeding speed regulation circuit for the CO_2 welding machine is designed based on TL494 chip, which has the self-protective function under the condition of current overloading.

通过对电压负反馈配合电流正反馈的送丝调速系统与转速负反馈调速系统的比较，得出了这两种调速系统的等效条件，并采用电压负反馈配合电流正反馈技术，设计了一种以TL494为核心的具有过电流截止保护功能的CO_2焊机送丝调速电路。

Make a model to help you determine the optimal number of tollbooths to deploy in a barrier-toll plaza.

建立一个模型来确定在一个容易造成阻塞的收费区中应该设置的收费亭的最优数量。