1 in the case of my grandpa,walking 20 kilometers a day was quite nothing when he was young.
(in the case of -- - -== taking -- -- for example -------拿 - -- - 来说,以 - - -为例)
2 Concerning your perfect sommer holiday plan,I can do nothing but agree to it.
(with respect to == about / concerning-------有关,关於 -- - -)