by courtesy
... by courtesy：礼貌起见 by courtesy of sb：承蒙某人的好意（或准许）；蒙某人提供（或赠送) courtesy of sb;by courtesy of sb：由某人好意提供 ...
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既然我来教堂出于自愿，仅仅为了礼貌起见，我(本应当)和大家一起下跪。
It would have been only courteous to kneel at the proper time, as all did, since I had voluntarily come to church.
youdao
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