The current situation is looking like Callback was just too ambiguous of a name.
目前的情况是Callback这个名字太模棱两可了。
No worries about the ambiguous future, just to clear now.
不为模糊不清的未来担忧，只为清清楚楚的现在努力。
Don't worry too much the ambiguous future; just make effort for the explicit present.
不为模糊不清的未来过分担心，只为清清楚楚的现在而奋发图强。
Don't worry too much the ambiguous future; just make effort for the explicit present.
不为模糊不清的未来过分担心，只为清清楚楚的现在而奋发图强。
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