Lagrange's identity
[計] 拉格朗日恒等式
?? 詞語組成解析
identity
[ai'dentiti]
n. 身份;[邏]同一性;個性;[數]恒等（式）;
??? 情景例句
Thanks. Excuse me.
謝謝。失陪一下。
May I take pictures?
我能照相嗎？
It's a fine day today, and everyone is busy.
今天的天氣很好，大家都很忙。