Tryptophan has to fight with other amino acids to cross the blood-brainbarrier and get into the brain.
色氨酸必须打败其他的氨基酸，才能通过血管-大脑的障碍物，到达大脑。
2
Terbutaline crosses the placental barrier and blood-brainbarrier of the fetus, which may lead to an autistic-spectrum disorder and other developmental disorders.
特布他林穿过胎盘屏障和胎儿的血脑屏障，可能导致自闭症系列障碍和其他精神障碍。
3
In the second stage the parasites cross the blood-brainbarrier to infect the central nervous system.