The streamers who spoke to the BBC say something must be done to protect children on Discord - but it shouldn't be at the cost of other users' sensitive information.
Advances in organ and computer models are raising the prospect that some animal experiments could be eliminated. But there are still huge hurdles to overcome.
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刘成的妻子早年曾怀过孕，但不幸流产。此后因子宫内膜粘连，再也没能怀上。
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