The client sells very complex software programs and services.

这个顾客销售非常复杂的软件项目和服务。

youdao

Programs in air transportation focus on aviation and air transportation services.

空中运输专业主要学习航空飞行及其服务。

youdao

All services and programs are free to all.

所有的服务和计划免费。

youdao

All services and programs are free to all.

所有的服务和计划免费。

youdao