answer difficult questions meaning in English

解答疑难问题

When applying for a job , you should be ready for an interview in which you often have to answer difficult questions
你若要申请，就得做好面试的准备，到时常常得回答些棘手的问题。
During sale : professional engineer will answer difficult questions raised from actual applications by customers ; supply technical support ; give training to the customer ' s technical persons on the site ; give lecture of equipment installation and operation ; maintenance and points for attention to make customer feeling our integrity
售中专业技术人员及时解答用户在应用过程中将会遇到的疑难问题和相关的技术支持，并对客户方的技术人员进行现场培训，讲授设备的安装操作、保养和应用注意事项，使客户感受到“环球人”的真诚。
During sale : professoinal edgineer will answer difficult questions raised from actual applications by customers ; supply technical support ; give training to the customer ' s technical persons on the site ; give lecture of equipment installation and operation ; maintenance and points fot attention to make customer feeling our integrity
售中：专业技术人员及时解答用户在应用过程中将会遇到的疑难问题和相关的技术支持，并对客户方的技术人员进行现场培训，讲授设备的安装操作、保养和应用注意事项，使客户感受到“佳能人”的真诚。