至今尚无人宣称说组群选择是不可能的，但从数学的角度上来看是这样。

Noone ever claimed group selection is impossible, but it looks mathematicallyunlikely.

youdao

也有其他人已宣称计划出口中国制造的汽车到美国，但无人已经推进到市场。

Others also have announced plans to export Chinese-made cars to the United States but none has yet made it to market.

youdao