noun🔗Share流明，光通量单位 In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm."The new desk lamp provides 800 lumens of light, making it much brighter for studying. "这款新台灯提供800流明的光照，所以学习的时候会更亮。physicsenergytechnicalunitChat with AIVocabulary GamePractice Reading
noun🔗Share腔，内腔，管腔。 The cavity or channel within a tube or tubular organ."The doctor inserted a small camera into the artery to examine the lumen for any blockages. "医生将一个小型摄像机插入动脉，检查内腔是否有堵塞。anatomyorganphysiologymedicineChat with AIVocabulary GamePractice Reading
noun🔗Share细胞腔，内腔 The cavity bounded by a plant cell wall."The plant cell's lumen, visible under the microscope, appeared as a clear space enclosed by the surrounding green cell wall. "在显微镜下可以看到，植物细胞的细胞腔呈现为被周围绿色细胞壁包裹的清晰空间。biologyplantpartstructureChat with AIVocabulary GamePractice Reading
noun🔗Share管腔，内腔 The bore of a tube such as a hollow needle or catheter."The doctor checked the IV line to make sure the lumen wasn't blocked. "医生检查了输液管，确保管腔没有堵塞。medicineanatomypartdeviceChat with AIVocabulary GamePractice Reading
