开动脑筋:mulling things over
展开丰富的想象: make a fertile imagination
激发你的想象力：arouse your imagination
打开思路：open up your train of thought
use your brain/think hard
use/expand your imagination
stimulate your imagination
broaden your thoughts
开动脑筋:mulling things over
展开丰富的想象: make a fertile imagination
激发你的想象力：arouse your imagination
打开思路：open up your train of thought
use your brain/think hard
use/expand your imagination
stimulate your imagination
broaden your thoughts
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