the stoma
特指已知或唯一的气孔。
The stoma regulates gas exchange in the leaf.
气孔调节叶片中的气体交换。
气孔
stomata — plural of stoma
叶子或茎表皮上的小孔,气体和水蒸气通过；叶子或茎上的微小表皮孔,气体和水蒸气可以通过；膜上的小开口；尤其是手术构造的开口,如结肠造口术或回肠造口术后的废物排出口；人工肛门；口或类似口的开口(尤其是通过手术在身体表面创建的通向内部器官的开口)；类似口的开口,如线虫的口腔
a tiny pore in a plant's leaf or stem through which gases and water vapor pass
叶子或茎表皮上的小孔,气体和水蒸气通过
One of the tiny pores in the epidermis of a leaf or stem through which gases and water vapor pass.
叶子或茎上的微小表皮孔,气体和水蒸气可以通过
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
膜上的小开口；尤其是手术构造的开口,如结肠造口术或回肠造口术后的废物排出口；人工肛门
A small opening in a membrane; a surgically constructed opening, especially one in the abdominal wall that permits the passage of waste after a colostomy or ileostomy; an artificial anus.
口或类似口的开口(尤其是通过手术在身体表面创建的通向内部器官的开口)
a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)
类似口的开口,如线虫的口腔
A mouthlike opening, such as the oral cavity of a nematode.
Under the microscope, we could see a single stoma surrounded by two guard cells.
在显微镜下，我们能看到一个气孔被两个保卫细胞包围着。
用法提示：stoma 在此句中指植物叶片表面的气孔。
The plant closes its stomata at night to reduce water loss.
这种植物在夜间关闭气孔以减少水分流失。
用法提示：stomata 是 stoma 的复数形式，表示多个气孔。
Carbon dioxide enters the leaf through a stoma on the underside.
二氧化碳通过叶片下表面的气孔进入叶子。
用法提示：stoma 在这里作可数名词，表示叶片上的微小孔洞。
特指已知或唯一的气孔。
The stoma regulates gas exchange in the leaf.
气孔调节叶片中的气体交换。
首次提及或泛指。
A stoma is a tiny pore in the leaf surface.
气孔是叶片表面的微小小孔。
表示气体或水蒸气的路径。
Water vapor exits through the stoma.
水蒸气通过气孔排出。
grammar · medium
易错句子The leaf has many stoma.
正确表达The leaf has many stomas.
“stoma”是可数名词，复数形式为“stomas”，表示多个气孔时应用复数。
grammar · medium
易错句子The gas passes in the stoma.
正确表达The gas passes through the stoma.
根据定义，气体和水蒸气通过气孔（pass through）进出，因此应用介词“through”而非“in”表示通过。
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