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某种无形力量的可怕阴影,虽不可见,却在我们中间漂浮。
The collaboration between theory and experiment is essential for the advancement of physics.
杀死他的父亲然后奖赏他的儿子,与吃他的儿子然后再奖赏他的父亲有什么不同呢? 
Innovation in fishing technology must go hand in hand with conservation efforts. They are not opposing forces, but complementary ones.