我刚刚弄清楚了colspan属性。我可以这样做:
┌-----------------------------------------------┐
| | | | |
|-------+----------+----------+----------+------|
| | | | | |
|-------+----------+---------------------+------|
| | | | | |
|-------+----------+---------------------+------|
| | | | | |
└-----------------------------------------------┘
但我真正想做的是这样的:
┌-----------------------------------------------┐
| | | | |
|-------+----------+----------+----------+------|
| | | | | |
|-------+----------+---------------------+------|
| | | | | |
|-------+----------+----------+----------+------|
| | | |
└-----------------------------------------------┘