how nice it would be if
那该有多好啊
以上为机器翻译结果，长、整句建议使用 人工翻译 。
How nice it would be if I could go with you!
要是我能跟你一块去，那该多好哇！
《新英汉大辞典》
How nice it would be if you stayed a bit longer.
要是你能多呆些时间多好啊！
youdao
How nice it would be if you stayed a bit longer!
要是你能待些时间多好啊！
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