The prime transmission methods of human are the oral transmission, and then the writing which makes up the shortage of oral transmission.
人类最初的传播方式是口头交谈,然后人类发明了书写,弥补了言谈的不足。
Bitter constraint, and sad occasion dear, Compels me to disturb your season due: For Lycidas is dead, dead ere his prime... Milton is lamenting, once again, that Milton has been compelled to begin writing.
因为亲友的惨遇,痛苦的重压,迫使我前来扰乱你正茂的年华:,利西达斯死了,死于峥嵘岁月。,弥尔顿再一次哀叹道,他是不得以写这首诗的。
They come from writing i prime and j prime in terms of i and j, then sticking it in an expression and identifying the new representation.
写出用 i 和 j 来表示 i' 和 j' 的式子,再代入分量的表达式,就能得到新的式子
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