如何翻译 ”一会儿哭,一会儿笑,“ 这样的词组,--一会儿干什么,一会儿干什么

以下英文解释和例句完全引自著名的Collins原版词典。中文为本人注释。
You use the expression "the next moment", or expressions such as "one moment he was there, the next he was gone", to emphasize that something happens suddenly, especially when it is very different from what was happening before。
* The next moment there was an almighty crash。
* He is unpredictable, weeping one moment, laughing the next。(如果上面的英文你解释你看不懂的话,这个例句就是完全地道的对应你的那句话。）

用one minute和the next （minute）也可以