A 2009 study published in the journal Cancer Research showed that specially-engineered nanoparticles can cross the barrier and attach to tumor tissue.

2009年，发表在《癌症研究》上的一篇论文指出，新型的纳米粒子可以穿过屏障，并附着在肿瘤组织上。

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Treatment success in the second stage depends on a drug that can cross the blood-brain barrier to reach the parasite.

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。

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Although skin can be a relatively impermeable barrier, a few drugs have just the right physical and chemical characteristics to cross it at reasonable rates.

虽然皮肤是相当不易穿透的障碍，但少数药物的物理化学特性，恰好能让这些药物以合理的速率穿过皮肤。

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The New York Post is the latest newspaper to cross the iPad barrier, with a new, full-content tablet edition readers will be able to purchase as a monthly or annual subscription.

FORBES: New York Post to Sell Subscriptions on the iPad

The road will cross a small stream and continue parallel to the stream for some time before the first blue cross appears on the side barrier of a small cement bridge.

BBC: Romania��s Prince Charles walk

Substances that cannot cross this barrier are unlikely to make effective treatments for a brain disease.

ECONOMIST: Creutzfeldt-Jakob disease