2. I have a serious disturbance on board. 我在船上有一次严重的动乱。
3. This is a serious book , not an entertainment. 这是一本严肃的书,不是供消遣的。
英英解释
adj.
1. concerned with work or important matters rather than play or trivialities
2. of great consequence
3. causing fear or anxiety by threatening great harm
4. appealing to the mind
5. completely lacking in playfulness
6. requiring effort or concentration; complex and not easy to answer or solve