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The only limit is the one you set yourself.

在檢查動物各部分時，我勤奮努力以求達到真理。

Success is stumbling from failure to failure with no loss of enthusiasm.

I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.

成功的道路是采取大規(guī)模、堅定的行動。