A stoma is an opening through which carbon dioxide goes in and oxygen and water vapor escape.

气孔是二氧化碳进入而氧气和水蒸气逸出的开口。

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Stoma (pl. stomata) One of a large number of pores in the epidermis of plants through which gaseous exchange occurs.

植物叶片表皮存在的数目众多的小孔，打开时允许气体自由出入进行交换。

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The method for measurement of the length of stoma guard cell was proved to be a simple way of estimating ploidy of the regenerated plants.

通过测量气孔保卫细胞长度来评估再生植株的染色体倍性是一种简单可行的方法。

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The surgeon creates an opening in the patient's side, which is called a stoma.

BBC: Bladder cancer

Stoma care refers to the care required by patients who have had colostomies and other similar procedures, in which a piece of the large intestine or colon is diverted to an opening in the abdominal wall, known as a stoma.

BBC: Medical companies 'waste money' on needless equipment

Pat Black is a consultant stoma nurse who has studied the huge growth in prescribing accessories to stoma patients.

BBC: Medical companies 'waste money' on needless equipment