和血脑屏障相同，它是选择性可透的，阻挡血液中的有害物质进入到精致的感光层。
Like the blood-brain barrier, this is only selectively permeable, keeping any toxins in the blood from reaching the delicate photoreceptors.
新一代的透气型隐形眼镜在佩戴时有很好的透氧性，可避免眼睛干燥和疼痛。
A new generation of gas-permeable lens, they allow oxygen into your eyes during wear, preventing your eyes from becoming dry and sore.
潜水团队钻透俄罗斯西北部白海冻结的海面，受到笑容可掬的白鲸欢迎。
When dive teams drill through the frozen surface of the White Sea off the north-west coast of Russia, they are greeted by grinning belugas.
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