1. spend something on something/ in doing something 花时间做某事

He spends too much on clothes. 他在衣着上花费很大。

spend a lot of time on a project/in explaining a plan 花很多时间进行某项目/解释某一计划

2. by the way 顺便说说，顺便问一下；在途中

顺便说说：
By the way, what was the funniest suggestion I saw?
顺便说说我碰到的最有趣的建议。

Komodo dragon, by the way, why does man have to take him all away?
顺便说说，科莫多龙。为什么人们都要夺走你的生命？

顺便问一下：
By the way, is Dr. Johnson available on Saturday?
顺便问一下，约翰逊大夫星期六有空吗？

By the way, you got the prescription from Dr. Johson, didn’t you?
我顺便问一下，你的这个药方是约翰逊大夫给你开的吧。

在途中：
They stopped by the way to eat.
他们在途中停下来吃饭。

You will have a fine view of Moray Firth by the way.
在途中你将欣赏到马里湾的美丽景色。