perfect 5th
完美的5日
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Track and Field decreases every year, quality is more obvious, the system is not perfect social security system. 5th, Athletes have few opportunities to participate in high level competitions.
田径后备人才数量逐年下降，质量问题较为突出，社会保障体系制度不够完善。5、运动员参加高水平比赛机会不多。
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