"I cannot narrow down the rules for this game"
"He was trapped in a difficult situation"
"pin up a picture"
1.确定;证实
If you try topin somethingdown, you try to discover exactly what, where, or when it is.
pin down的解释
e.g. It has taken until now topindown its exact location...
直到现在才确定了它的准确位置。
e.g. I can onlypin itdown to between 1936 and 1942...
我只能确定是在1936至1942年期间。
2.迫使…作出决定(或明确表态)
If youpin someonedown, you force them to make a decision or to tell you what their decision is, when they have been trying to avoid doing this.
e.g. She couldn'tpin himdown to a date...
她没有办法强迫他答应约会。
e.g. ...their repeated efforts topin himdown on a number of topics...
他们迫使他对一系列问题明确表态的再三努力
1. 阻止:pimply 肿泡的 |pindown 阻止 |pin money 零花钱
2.
2. 船首前倾:pin connecting 销连接 |pindown 船首前倾 |pin drill 针头站
3. 牵制:pin dot matrix ==> 针点矩阵 |pindown ==> 牵制 |pin drafter ==> 针梳机,针梳牵伸机