No matter in colour or details on the use of similar elements, although it safe, appropriate use of opposing elements, clever union, will get twice the result with half the wonderful effect.

无论在色彩或细节的使用类似的元素，尽管它安全，使用合适的对立的元素，巧妙结合，将事半功倍的神奇的效果。

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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 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