"随时为你准备"的意思是 "ready to help you anytime", "always ready to assist you" 或 "prepared to assist you at any time"。这句话的来源可能源自于人们希望表示自己对他人的愿意帮助或支持，并且随时准备好去做到这一点。
下面是一些英文例句及其中文翻译：
"I'm always ready to help you with your homework if you need it." (我随时都愿意帮你做作业。)
"I'm prepared to assist you with whatever you need." (我随时准备好为你提供帮助。)
"I'm here for you if you need anything. Just let me know and I'll be ready to help." (如果你需要什么，我会随时为你准备。只要告诉我，我就会准备好帮助你。)