问题: 这句话中的whatever's there是什么意思？
Just open a class definition for an existing class, and the new contents you specify will be added to whatever's there.
解答:
whatever's there相当于anything that is there
类似的句子有：Whatever is left over is yours＝anyting that is left is yours.剩下来的所有的都是你的。
whatever's there，Whatever is left over 这种用法可以说是一个自带先行词的定语从句。what(=the thing that),whoever(= anyone who)都有这种用法.
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