The chemicals are present in small amounts, but the long term effects of smearing them on our heads, faces, and bodies every day are unknown.

里面化学成分仅是很少的量，但长期地每天涂抹在我们头上、脸上和身体上的效果却是不可估量的。

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Building trust for an unknown Indian brand is the biggest difficulty he faces.

为一个不为人知的印度品牌建立信任感是他面临的最大困难。

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New faces, new surroundings and meeting people is an unknown journey that I look forward to as I go to class each day.

每天我上课的时候，我都在未知的旅途中行进，见到新的面孔，来到新的环境。

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For example, a Syrian Arab News Agency reporter, citing an official source, said Thursday that "terrorists" threw "unknown powder" in Idlib residents' faces to accuse the army of using chemical weapons.

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Mr Fraser, 44, now faces a single charge of murder "with others unknown".

BBC: Arlene murder trial charges