noun🔗Share环, 圆环 A ring- or donut-shaped area or structure."The dartboard featured a red annulus worth double points. "飞镖靶上有一个红色的环状区域，击中它可以获得双倍积分。areapartstructureanatomymedicinebiologyChat with AIVocabulary GamePractice Reading
noun🔗Share圆环，环形区域 The region in a plane between two concentric circles of different radii."The target around the bullseye had an annulus of blue paint. "靶子中心圆的周围有一圈蓝色的环形区域。mathareaChat with AIVocabulary GamePractice Reading
noun🔗Share环面，环状区域。 Any topological space homeomorphic to the region in a plane between two concentric circles of different radius."The donut's shape, with its central hole, is an example of an annulus. "甜甜圈的形状，因为中间有个孔，就是一个环面/环状区域的例子。mathspaceChat with AIVocabulary GamePractice Reading
noun🔗Share日环，光环 The ring of the sun not covered by the moon in an annular solar eclipse."During the annular solar eclipse, a bright annulus of sunlight remained visible around the dark moon. "在日环食期间，黑暗的月亮周围仍然可以看到一圈明亮的光环。astronomyspacescienceChat with AIVocabulary GamePractice Reading
noun🔗Share环带 Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying."The science student observed how the annulus on the fern's sporangium dried and snapped back, scattering spores into the air. "那个理科生观察了蕨类植物孢子囊上的环带如何因干燥而弯曲弹开，从而将孢子散播到空气中。biologyplantstructurepartChat with AIVocabulary GamePractice Reading
noun🔗Share菌环 The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom."The young mushroom had a prominent annulus, a delicate ring around its stem, showing where the cap had once been connected. "这朵幼嫩的蘑菇有一个清晰的菌环，那是环绕着菌柄的一圈薄薄的环状物，表明了菌盖曾经连接的位置。organismplantbiologypartChat with AIVocabulary GamePractice Reading
noun🔗Share环空，环状空间。 (oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow."During the well test, engineers monitored the pressure in the annulus to ensure no gas was leaking from the production tubing. "在井测试期间，工程师们监测环空内的压力，以确保生产油管没有气体泄漏。technicalindustryenergyChat with AIVocabulary GamePractice Reading
