The dear friend was mad on the subject of the diamond mine.

这位亲爱的朋友对钻石矿的事情很生气。

They went out riding every day, the prince was mad on Julien.

他们每天出去骑马，王子对于连很生气。

'It was your follower, Tommy Thrupp, that found it. Tommy is mad on fishing. And he quite often goes out before breakfast to fish, because apparently that is a good time'. The 'apparently' was typically Marta, he thought.

“是你的追随者 Tommy Thrupp 发现了它。汤米对钓鱼很着迷。他经常在早餐前出去钓鱼，因为显然那是个好时机。 “显然”是典型的玛尔塔，他想。