spare no effort to的effort要否加s?

spare no effort to的effort要否加s? spare no effort effort要加s吗 Ishod spare no effort to love spare no effort 和 spare no efforts的区别 spare no effect还是spare no effort? 一个英语词组的疑惑,是to spare no efforts to do还是to spare no effort to We must spare no effort to do it. spare no effort to develop myself 如何翻译? spare no effort to do sth 是固定用法吗? 英语翻译不遗余力做什么事情的英语说法是spare no effort to do 还是 spare no efforts make every effort 和spare no effort意思一样吗? 是spare no effort to do还是spare no efforts to do?