hang; knack; know-how

1. 不要為此灰心喪氣，你會找到訣竅的。
   Don't let that get you down. You'll get the hang of it.
2. 身體健康的訣竅之一是定時運動。
   One of the secrets of good health is regular exercise.
3. 要是我能有一點你的那種訣竅就好了。
   If I could only latch on to some of your know how!
4. 據我們所知，支付技術訣竅的最常用辦法是初期付款和提成付款相結合。
   As far as I know, the common form of payment for technical know- how is a combination of an initial payment and royalty.

竅的英語翻譯：