她一走出视线就突然开始跑。
比赛中有的运动员会突然出现腹痛，其原因一般来说是准备活动做得不充分，加上天气比较冷，开始跑时吸入了大量的冷空气或起跑速度过快等，出现“岔气”现象。
Some athletes may suffer a sudden abdominal pain during the race, which is often caused by insufficient warming-up exercise, a cold weather so that a lot of cold air is inhaled, or running too fast.
那狗突然开始绕着房子跑。
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