When this second group of modified mice were tested alongside ordinary ones,they showed less endurance and had less ability to take up sugar from their bloodstreams.

当这第二组转基因小白鼠与普通小白鼠一同测试后，发现它们的耐力更差，从血液中获取糖分的能力也更低。

Research on this system suggests that bats have a mucous membrane along the intestinal tract that acts as a barrier to prevent too much iron from getting into their bloodstreams.

研究这个系统表明，蝙蝠有沿着肠道的粘膜来作为屏障，以防止过多的铁进入血液。