If you're experiencing crushing chest pain with or without pain in your left arm, are short of breath, or have a sense of impending doom, you may be having a heart attack.
如果你遇到伴有左手臂疼痛的强烈胸痛，或仅仅是强烈的胸痛，呼吸短促，或休克，你可能是心脏病发作了。
Especially if you have to ride the bike up the hill, where you are short on breath, a full load of "truck air" feels very painful inside your body.
特别是骑上坡的时候，上气不接下气，满载的卡车排放的尾气让人感觉痛苦。
Just play short pieces, and take a rest if you are feeling out of breath.
开始时，可以用一些短小的片段来练习呼吸。
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