friendly造句

The spokesman said the tone of the letter was very friendly.
发言人说信函的语气非常友好。

She was somewhat unapproachable but I'm sure she wanted to be friendly.
她有些不好接近,但我确信她想表现得友好一些。

On balance, the book is a friendly, down-to-earth introduction to physics.
总而言之,这是一本通俗而务实的物理入门书。