They are firm but flexible.

他们坚持己见且灵活变通。

youdao

Set firm timelines, but leave features flexible.

制定严格的时间安排，但是保持灵活的特性。

youdao

Be Flexible But Firm Encourage your staff for a frank discussion of goals, tactics and strategies. Do not change your direction without good reason.

灵活而坚定的鼓励你的员工对目标，战术和战略进行坦诚的讨论。没有充分的理由，不要改变你的方向。

youdao

Treasury ministers want to stand firm on the principle but be flexible on the practice - examining ideas to roll over unused tax relief from one year to the next or allowing tax free lifetime legacies.

BBC: Charity tax: Wanted - a solution