sān dān ㄙㄢ ㄉㄢ 三单（三单） 是指英语中第三人称单数形式
第三单体 ENB ; HQ-TPA
第三单元 UNIT THREE ; note taking in Interpreting ; Unit Three Letter of Intent ; Unit Three Letters of Recommendation
第十三单元 Unit Thirteen ; lnlerpreting for Business Purposes ; The Mud-backs ; Do You Really Believe That
三单元组 [高分子] triad
三单体 SIPM
高三第十三单元 the mystery of the moontone
第三单元含义 Application of first part
三单元 Going Places
液体三单体 SIPE
已知双金属和三金属催化剂提供了优于单金属催化剂的性能。
It is known that bimetallic and trimetallic catalysts offer improved properties over single metal catalysts.
糖尿病患者常见三种神经病变：周围神经病变、自主神经病变和单神经病变。
The three major forms in people with diabetes are peripheral neuropathy, autonomic neuropathy, and mononeuropathy.
肉，沙拉还有马铃薯是她购物单上的三个项目。
Item Meat, salad, and potatoes were three of the items on her shopping list.
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