大脑就像肌肉一样时时需要锻炼才能保持锋利。
The brain is like a muscle and needs to be exercised to stay sharp.
记住要保持锋利。
虽然他可以保持锋利的牙齿，他很聪明，好奇的，和体贴。
While he can be sharp, he is clever, curious, and thoughtful.
每次使用完后要清理电动剃须刀以保持刃口锋利。
Clean the shave after each use to keep the cutting edge sharp.
保持你的钩子足够锋利，但是要小心的打磨它们。
保持笔直的锋利的锯齿。
他害怕它的锋利的牙齿和想要一个保持作为一个宝贝。
He was afraid of its sharp teeth and wanted one to keep as a treasure.
锋利物品盒必须保持干燥并不应有任何消毒剂。
The boxes must be kept dry, and should not contain any kind of disinfectants.
锋利物品盒必须保持干燥并不应有任何消毒剂。
The boxes must be kept dry, and should not contain any kind of disinfectants.
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