blood-air barrier
blood-air barrier
blood-testis barrier
blood-testis barrier
gastric mucosal barrier
gastric mucosal barrier
堡礁（barrier reef）
堡礁（barrier reef）
Placenta barrier (placenta membrane)
Placenta barrier (placenta membrane)
The Great Barrier Reef is huge and it’s clearly
The Great Barrier Reef is huge and it’s clearly
3.According to the passage, what might be a barrier to marriage in 2050 ?
3.According to the passage, what might be a barrier to marriage in 2050 ?
_______ (缺少) confidence is the biggest barrier to be a good sales person.
_______ (缺少) confidence is the biggest barrier to be a good sales person.
blood - testis barrier中最重要的结构是
blood - testis barrier中最重要的结构是
The Great Wall posed a barrier to the communication between the north and the south.
The Great Wall posed a barrier to the communication between the north and the south.