I spent much energy in studying.
你好！投入大量精力Put a lot of energy into it
investment英 [ɪnˈvestmənt] 美 [ɪnˈvɛstmənt] n.投资，投资额;封锁;（时间、精力的）投入;值得买的东西复数： investments
形容词的话 involved， devoted， dedicated 都行名词的那个意思 input
I think this subject is very important so I have pay great attention on it
I HAVE SPENT A LOT OF TIME ON STUDY.
I spent a lot of effort in learning.
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