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1·There is no reason why love shouldn't cross the age barrier.

爱情没有理由不应跨越年龄障碍。《柯林斯英汉双解大词典》

2·The first problem is that the “happy path” does not cross boundaries very well: the key barrier is the barrier of intention.

第一个困难是“幸福之路”并不能很好地跨越边界：主要的障碍来自于利益不同。

3·Tryptophan has to fight with other amino acids to cross the blood-brain barrier 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。

4·Some of these AI viruses have also been reported to cross the species barrier and cause disease or subclinical infections in humans and other mammals.

也有报告称，某些禽流感病毒跨越物种界限传播，并导致人类和其他哺乳动物患病或亚临床感染。

5·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。

6·And if a molecule cannot cross the barrier, it will not make an effective neurological treatment.

不能通过屏障进入脑的分子当然就无法完成有效的神经治疗。

7·And a little ways down the freeway there is a gap in the center barrier, and I calmly turn the wheel and cross over.

沿着高速公路开了一小段路后，在中间路障处有一个洞，我平静地转动方向盘，穿了过去。

8·If the cells did cross the placental barrier, the child's immune system should have recognised them as foreign invaders and destroyed them.

如果癌细胞确实穿过胎盘屏障，孩子的免疫系统应该会将它们视为入侵者，从而消灭它们。

9·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。

10·Introduced correctly, learners cross a fear-barrier - this journey has wider benefits in terms of confidence.

经过正确的引导，初学者“跨越了恐惧障碍”，这种经历有利于信心的建立。