A three-year-old might need help in understanding that other children feel pain just as he does, and that hitting a playmate over the head with a heavy toy requires an apology.

一个三岁的孩子可能需要他人帮助，才能理解其他孩子也和他一样会感到疼痛，用玩具重重地打了玩伴的头是需要道歉的。

youdao

On day three, the pain began to subside.

到了第三天，疼痛开始消退。

youdao

She had gone to hospital three times complaining of back pain, respiratory trouble and high fever only to be sent home with a prescription.

她去过医院三次抱怨背部疼痛，呼吸困难和高烧，但最终还是在拿到处方后被要求回家。

youdao

It will result in head pain, stomach problems and a feeling of tiredness after two to three hours.

VOA: special.2010.02.02

Recently, American experts held a three-week training class in Ukraine about pain control.

VOA: special.2009.02.10

Doctors speak of three kinds of pain: acute,chronic and breakthrough.

VOA: special.2009.02.10

Three pain and outpatient centers in Tennessee have reached out to more than 1, 000 patients who could have been exposed, with state officials saying they had the country's largest stockpile of the steroid injections made by compounding center.

WSJ: Illnesses Fuel Scrutiny of Pharmacies

The first of the three inflicts pain and temporary blindness.

ECONOMIST: A sick inventory

Examined on a more realistic basis, the true gap in teacher pensions is nearly three times the official amount--and the taxpayers who will have to close it are in for three times the pain.

FORBES: Commentary