此句中about it作什么成分,感觉没有必要使用啊!
The secret to eating less and being happy about it may have been cracked years ago.
有必要。it 指前文的eating less(少吃);
being about it:对此(少吃)感到满意、高兴、快乐。
如果没有about it,感到快乐跟少吃就没有联系了,快乐的原因就不得而知了。
The secret to eating less and being happy about it may have been cracked years ago.
【翻译】少吃而感到快乐的秘诀,可能在多年前就已经被破解了。
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