Definition: effective and showing intelligence Level: B1
这个谜语很巧妙，你能猜出答案吗？
This riddle is very ___clever. Can you guess the answer?
那是个节约能源的巧妙主意。
That's a ___clever idea for saving energy.
我有一个开罐子的巧妙小工具。
I've got a ___clever little gadget for opening jars.
