信号箱
After the body heals, a signal from the brain that normally contracts a muscle in the arm now tightens one in the chest.
身体复原后,通常收紧手臂肌肉的大脑信号现在会收紧胸部肌肉。
Sever chest or back pain could signal a heart attack.
剧烈的胸痛或背痛可能是心脏病发作的信号.
Severe chest or back pain could signal a heart attack.
剧烈的胸部或背部疼痛可能使心脏问题.
Chest pains can be a warning signal of heart problems.
胸部疼痛可能是心脏病的报警信号。
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