With labored breath, he leaned against the door frame, gazing into the kitchen.

老人嘴里喘着气，靠在门框上，眼睛凝神着厨房。

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"Shortness of breath", "a feeling of not being able to get enough air", and "labored breathing" are all terms used by patients to describe the symptom of dyspnea.

“气促”“不能呼吸足够空气”和“用力呼吸”是病人描述呼吸困难症状时常用的词。

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Breathing more likely becomes labored not because of a lack of oxygen with each breath, but because the body is running hotter and needs more oxygen to cool itself.

导致呼吸困难的因素，并不是每次呼吸氧气不足，而是因为机体变热需要更多的氧气冷却自己。

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