让这把椅子折叠起来的窍门是什么？

What's the ___trick to getting this chair to fold up?

我学了一个快速剥蒜的实用技巧。

I learned a useful ___trick for peeling garlic quickly.

我希望能学会这些运动的所有规则和窍门。

I hope to learn all the rules and ___tricks of these sports.