Don’t look so glum!
别那样洋洋自得。Faced with all this, no wonder Americans are glum.
世道艰辛，无怪乎美国人夷易近要洋洋自得了。When the opposition scores, he looks glum.
当对手进球的时间，他一脸疑惑。The doctor had assured him it was nothing serious, but he was looking very glum.
He was a charming mixture of glum and glee.