He agreed to pay at specified rates per diem.

他同意每天按规定的数额付款。

《牛津词典》

Other reported changes to company travel policies include encouraging day trips (13%), booking with hotels and airlines that provide preferred rates (12%), and enforcing per diem allowances (10%).

其它企业差旅政策改变的形式包括：鼓励员工当日往返(13%)、选择提供优惠价格的酒店和航空公司预订(12%)以及强制执行每日津贴规定(10%)。

youdao

Thee discount rates have failed to come down below 2 sen per diem, even in the middle of the month.

甚至到本月中旬， 蠙折扣率也未下降到日率二分以下。

youdao

According to a letter that APA sent to members on Saturday, the MOU also brings per diem pay improvements to align more closely with rates at Delta and United.

FORBES: Union: American Pilots Would Get $522 Million More in a Merger