维生素经辐照或这种热处理后究竟变成了一些什么物质通常还是末知的。
The substances to which vitamins are converted as a result of irradiation or such thermal treatments are generally unknown.
在19世纪末的德国，有个鲜为人知的体育项目，我从未听说过，也很难发音。
There was an utterly obscure Germany one in late 19 century, which is I've never heard of before, it's unpronounceable.
该模型直接反映了末知节点压力与已知信息的关系，可用于解决已知信息不充分的问题，因而具有广泛的实用性。
The model directly reflects the relationship of unknown nodal pressures and known information, which can be used to solve the problem of insufficient known conditions.
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