Bumblebees exposed to up to seven times as much toxic metal as honeybees
研究表明，熊蜂积累的重金属含量是蜜蜂的七倍，影响了它们的觅食和繁殖。
A SpaceX rocket just crashed into the moon. Now, the race is on to get a look at the impact site
今天清晨，一枚 SpaceX 火箭以七倍音速撞向月球。现在，月球轨道飞行器正试图查看后果。
