After caching so much food, Jack's back aches.
藏了那么多食物后，杰克的背很酸。
You may find your knees hurt, or your back aches.
你可能发觉膝盖容易受伤，或者背痛。
People having back aches are afraid to bend over.
腰疼的人不敢弯腰。
No wonder his back aches when he has been humped over his desk all day!
难怪他的背痛，他伏案工作了一整天！
No wonder his back aches when he has been humped over his desk all day!
难怪他的背痛，他伏案工作了一整天！
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