两端需穿着，以避免尖锐边缘或跨线程。
The ends should be dressed as to avoid sharp edges or cross threading.
这个图会跨线程按照出现的次数对表达式的值进行分组。
A graph that groups the value of an expression with the number of occurrences across threads.
如果显示两条线，则是由于潜在的跨线程依赖项而未计算表达式。
If the two threads appear, the expression was not evaluated because of a potential cross-thread dependency.
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