1、He was in one of his grum moods and didn't want to talk to anyone.
他心情暴躁，不想和任何人说话。
2、It's hard to work with him when he's so grum all the time.
他一直都情绪不好，和他一起工作很难受。
3、The file size is too large because it's saved in a grum format.
这个文件大小太大了，因为它是以长字节的格式保存的。