on the pin

基本解释

So because there is no friction on the pin - and because the strings are massless-- only because of that must the tension be everywhere the same.
所以，由于图钉没有摩擦,且细绳没有质量-,细绳的张力,一定处处相等。
Focusing on the pin number, it then goes into a switch structure that takes a different action depending on which sensor is connected to the pin.
以管脚编号为中心，然后再进入到一个 switch 结构，根据连接到此管脚的传感器来采取不同的措施。
When I have something I have to remember (a bill to pay in a few weeks for instance) I put it in a prominent place on the pin board above my computer.
如果有我需要记住的事情，例如过几周就要偿还的账单，我把它放在我电脑上插针板的显著位置。

"I was trying," he said, "to put the history of mankind in one sentence." Later he said, "I am still trying to do it, but now I want to put it all on the head of a pin."

Today, Mr Sarkozy's rivals on the right pin it on him.
ECONOMIST: French anti-Americanism
On your breadboard connect the MIDI circuit as follows: The collector is connected to a 220 ohm resistor which is connected to the second pin from the left on the back of the female midi connector (labelled pin 5).
ENGADGET: How-To Control Csound with a Custom Midi Controller: Hardware (2 of 2)
Mr. WEISBERG: Yes and I think the volatility, basically, is just indicative of the fact that people just simply don't know what to do and so everybody is sort of sitting on the head of a pin, easily pushed one way or the other depending on the headline or rumor.
NPR: Floor Trader Describes Wall Street Gyrations