我写信是关于您6月24日的来信。
I am writing ___with ___respect ___to your letter of 24 June.
关于成员的年龄,他们在15到20岁之间。
___With ___respect ___to the ages of the members, they are between fifteen and twenty years old.
公司已经就环境政策做出了改变。
The company has made changes ___with ___respect ___to environmental policies.