Sorry, I am a little nervous. I can't think it out at the moment.
祝你学习进步，更上一层楼！ (*^__^*)
不明白的再问哟，请及时采纳，多谢！
“我一时想不出来”，口语的话直接说no idea，就是I have no idea at the moment 或者 at present等等，希望有帮助
I can not think of it immediately.
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