头脑冷静的

What a Russian or a European commissar is like, I have no idea; he may be as frightening a personage as everyone says, but Commissar Po, whom I got to know rather well during my stay in Yehtao was a pink-cheeked young man in his late thirties, with a very insouciant manner and an ever-ready smile.

一个俄国或者欧洲的政治委员是怎样一副尊容，我不得而知，也许确如人们描述的那样，是一类可怕的人物。但藩一波却是一位面颊红润，态度和蔼，三十几岁的青年，总是面带笑容，头脑十分冷静。

Means the parent directory, so this command means to execute "toolchain.sh," which is in the current directory.

代表父目录，所以这个命令就是执行当前目录下的"toolchain.sh"。

Yes,In fact,I'm on our city ream.

是的。事实上我是我们市队的。