what was the hardest part of your record -breaking

what was the hardest part of your record -breaking
what was the hardest part of your record -breaking

what was the hardest part of your record -breaking
在你游泳挑战纪录的过程中,哪一部分,是最困难的?
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在你打破游泳记录的过程中，什么是最困难的