Intruders passing through the barrier break the beams and trigger an alarm contact, causing their presence to be detected without their knowledge.

入侵者通过屏障时会干扰红外光束，从而触发警报接触，使得他们被发现，而自己却不知情。

youdao

Objective to Investigate the disorder of colonic epithelium apoptosis and proliferation as well as its role of the epithelial barrier break down in ulcerative colitis (UC).

目的探讨溃疡性结肠炎(UC)上皮细胞凋亡与增殖的失调在UC上皮屏障破坏中所起的作用。

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They are fearful that unemployment will soon break the barrier of three million.

他们担心失业人数不久将突破300万大关。

《柯林斯英汉双解大词典》

And,he was proud of being the first African-American to break the color barrier in a major opera house.

VOA: special.2010.03.07

956, over 300 runners break the 4 minute barrier.

956年，超过三百名跑手突破四分钟界限。

哈佛公开课 - 幸福课课程节选

But if any film is going to break that barrier, Toy Story 3 has a good chance.

FORBES: Can Disney Score a Best Picture Oscar for 'Toy Story 3'?

SNECMA, relied on an after-burner to generate the acceleration needed for takeoff and to break the sound barrier.

ECONOMIST: Supersonics on the back burner | The

Karmazin has never figured out how to break through that barrier and take Satellite Radio to the next level.

FORBES: Ask Not What Karmazin Did For Sirius. Ask Instead What Sirius Did For Mel