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。
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。
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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