noun🔗Share流明 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 light bulb in the kitchen is much brighter; it emits 800 lumens. "厨房里新换的灯泡亮多了，能发出800流明的光。physicsenergyunitscienceChat with AIVocabulary GamePractice Reading
noun🔗Share管腔，内腔 The cavity or channel within a tube or tubular organ."The doctor examined the lumens of the patient's intestines to look for any blockages. "医生检查了病人肠道的管腔，想看看有没有堵塞。anatomyorganphysiologymedicinebiologyChat with AIVocabulary GamePractice Reading
noun🔗Share细胞腔，胞腔。 The cavity bounded by a plant cell wall."Under a microscope, the lumens of the plant cells looked like tiny empty compartments. "在显微镜下，植物细胞的胞腔看起来像一个个微小的空房间。plantbiologypartChat 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 lumens of the IV catheter to make sure they weren't blocked. "医生检查了静脉输液导管的管腔，确保它们没有堵塞。medicineanatomyparttechnicaldeviceChat with AIVocabulary GamePractice Reading
