如果没有，市场参与者不应该被强迫使用它们。
If not, market participants should not be forced to use them.
传统容器强迫使用指定的编程模型，轻量级容器则不是。
Where traditional containers force a given programming model, lightweight containers do not.
有时，程序员错误地强迫使用者用鼠标来描圆弧，这是相当有难度的。
Sometimes programmers erroneously force users to trace a circular arc with their mouse, which can be quite challenging.
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