sometimes fast sometimes slow 时快时慢 sometimes happy sometimes sad 花无百日红; 有时欢笑有时悲伤 ..
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船在浪中时快时慢前进 surging
时快时慢的游泳 stop-and-go swimming
时快时慢地游 stop-and-go swimming
时快时慢
Sometimes fast and sometimes slow
以上为机器翻译结果，长、整句建议使用 人工翻译 。
孩子学东西时快时慢。
Children do not learn at an even pace.
《牛津词典》
答案有点出乎意料，熵(用于度量无序程度)以不同速率增大，时快时慢。
The answer contains a surprise: Entropy (a measure of disorder) increases at different speeds, sometimes quickly, sometimes slowly.
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