my enthusiasm waned
我的热情减退了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
However, my enthusiasm waned.
但我的热情退了。
youdao
However, my enthusiasm waned. The time I spent at exercises gradually diminished.
然而，我的热情减退了。我在做操上花的时间逐渐减少了。
In less than four hours my enthusiasm had waned and I rather reproached myself for coming.
不到两个时辰，我早已意兴索然，颇悔此行了。
《新英汉大辞典》
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