B. b. b.
[医] 血脑障壁
🗣️ 情景例句
To advertise during prime time TV is very expensive.
在电视的黄金时段买广告是很贵的。
All things are difficult before they are easy.
凡事都是先难后易。
The tunnel would be well-ventilated if tall chimneys were built above sea level.
隧道就具备了良好的通风条件。