Although gene editing may help to prevent disease, many people are wondering if it is safe and ethical to use it on humans.

尽管基因编辑可能有助于预防疾病，但许多人对于将其用于人类是否合乎安全和道德感到疑惑。

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Although one power company executive yesterday joked to me that many plants in the U.S. would be safe because the technology they use is so old that software hardly plays any role in it at all.

虽然某个电力公司的执行官在昨天跟我开玩笑说美国许多电站都很安全，因为他们所使用的技术太过陈旧，软件在其中几乎完全不起作用。

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Although some animal studies have indicated it is safe, others have linked injections of BPA to breast cancer, liver damage, obesity, diabetes and fertility problems.

虽然一些动物研究表明它是安全的，但是其它研究把双酚A药剂与乳腺癌、肝损伤、肥胖、糖尿病以及生育力等各种问题联系到一起了。

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Although it is the least safe part of Central America, the northern triangle does receive tourists seeking Mayan ruins, volcanoes, beaches and jungles.

BBC: Central America��s shift in safety

Campaigners have called for warnings to be added to patient leaflets, although GSK, which makes the drug, insists that it is safe.

BBC: NEWS | Health | Drug alert scheme 'deeply flawed'

Police said people had been out on the river and although officers "understand their willingness to help, it is not a safe environment and could hamper the co-ordinated search".

BBC: River bed searched in Jordan Cobb hunt