This keeps out unauthorised people.

这就挡住了末经授权人员的入网.

This double-glazing keeps in the heat and keeps out the noise.

这种双层玻璃窗既保暖又隔音。

The low blood keeps out the most common reason is the insulin responded, was also the diabetic has used excessively many insulins.

低血搪最常见的原因是胰岛素反应，也就是糖尿病患者使用了过多的胰岛素。

The brain is protected by the blood-brain barrier BB, a gate-keeping system of cells that lets in nutrients and keeps out foreign substances.

大脑受血脑屏障的保护，是类似门卫系统的细胞，使营养进入而阻碍外来物质。