The trapper first hollow out a coconut, leaving a hole just big enough for a monkey to slip its hand in, but not big enough for the monkey to pull its fist out.

• 捕猴者先将一个椰子掏空，然后在上面挖一个小洞，洞口的大小恰好只能让猴子空着手伸进去，而无法握着拳头伸出来。