Treat unknown command line options as fatal errors instead of silently ignoring them.

对待未知的命令行选项，因为致命错误，而不是静静地忽视这些问题。

For some unknown reasons maybe a group of people suddenly realised the madness tulips failed to command the usual inflated prices in a gathering.

不晓得为了什么，可能有一群人清醒了，郁金香在一次交易中无法保持以往的高价钱。

The real action now is in branded generics, which command a premium in many emerging markets due in part to the fear that unknown products might be fake or of dubious quality.

目前的核心仍然在非专利品牌药品市场，因为担心市场上没牌子的药是假药或者质量不可靠，所以人们纷纷购买品牌药，这使得品牌药在许多新兴市场的需求增大。

For each time increment, the approximation of each unknown nodal function can be solved with the matrix left division command in MATLAB.

在每一个时间步长，利用MATLAB提供的矩阵左除命令即可求出各个未知节点的函数近似值。