Often there is no obvious cause.

哭闹经常无明显原因。

youdao

There was no obvious cause of gastrointestinal infection and history of gut diseases.

没有明显的胃肠道感染诱因，并且既往无胃肠道疾病史。

youdao

There was no obvious cause of gastrointestinal infection and history of gut diseases.

没有明显的胃肠道感染诱因，并且既往无胃肠道疾病史。

youdao