螺杆和机筒罕有引起降解的，尽管排气口或复杂的混合段或复杂的屏障段的确会引起降解。
The screw and barrel rarely cause degradation, though vents or complex mixing or barrier sections may do so.
第二阶段的成功治疗依赖于可穿过血脑屏障达到寄生虫的一种药物。
Treatment success in the second stage depends on a drug that can cross the blood-brain barrier to reach the parasite.
在第二阶段，寄生虫穿过血脑屏障感染中枢神经系统。
In the second stage the parasites cross the blood-brain barrier to infect the central nervous system.
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