这些英文符号和英文短语怎么读?# ?/ ?\ ?3/4 ?@ ?下划线?积分符号?对x求导?对x求二阶导数?

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integral sign ；Integralzeichen integral sign ；Signs For Integrals
To x derivation
Pray for x second derivation

# pound 井号
/ slash, divide, oblique 斜线,斜杠,除号
\ backslash, sometimes escape 反斜线转义符,有时表示转义符或续行符
∫ the integral of …的积分
@ at
underscore是下划线
四分之三 Three-quarters
对x求导The derivative of x
对x求二阶导数Find the second derivative of x