Additive identity
[计] 加性单位元素, 加法恒等元
🧩 词语组成解析
identity
[ai'dentiti]
n. 身份;[逻]同一性;个性;[数]恒等（式）;
🗣️ 情景例句
Wrap him in the blanket, Dad!
用毯子把他裹好， 爸爸！
The first step is the only difficulty.
万事起头难。
'He had travelled only seven miles across the Channel when his engine failed and he was forced to land on sea.
但他只在海峡上空飞行7英里，引擎就发生了故障，他只好降落在海面上。