Once trapped addiction, life difficult to extricate themselves.

一朝陷毒瘾，一生难自拔。

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Black holes are so powerful that matter and even light cannot get out once trapped.

黑洞是如此强大，以至于问题，甚至轻不能摆脱一旦被困。

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As the peat burns, an area that once trapped carbon dioxide has started releasing vast quantities of it.

大量的泥炭正在燃烧，这处曾经吸收二氧化碳的地方，如今却产生了大量二氧化碳。

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Nice work for Fox, who was once trapped on the other side of the velvet rope.

FORBES: Magazine Article

Once trapped in the network, that lawyer might enroll in a seminar on intellectual property or subscribe to the Web-based Tech Law Center.

FORBES: Rewriting the law

Once the energy trapped in coal is unleashed and its carbon sequestered, energy-laden hydrogen can be used directly in fuel cells.

ECONOMIST: The environment