He was anxious about an off-and-on pain in the abdomen.

他因时隐时现的腹痛而焦虑。

youdao

She has an off and on pain in the stomach.

她的胃疼好一阵，坏一阵。

youdao

She has an off and on pain in the stomach.

她的胃疼好一阵，坏一阵。

youdao