take up的具体用法如下：

1、开始(学习或从事等)。

例句：He dropped medicine and took up physics. 他放弃学医，开始学物理。For a long time I had wanted to take up writing. 很久以来我一直想从事写作。

2、继续。例句：We took up our journey the next day. 第二天我们继续赶路。This chapter takes up where the last one left off. 本章接续上一章谈到的内容。

3、占去(时间或空间)。例句：The table takes up too much room. 这桌子太占地方了。The work took up all of Sunday. 这活儿占去了整个星期天。

4、接纳(乘客等)，接受(挑战，建议，条件等)。例句：The bus stopped to take up passengers. 公共汽车停下来让乘客上车。He has taken up the bet. 他已接受打赌的条件。

5、 提出(商讨)，讨论。例句：There’s another matter which we ought to take up. 还有一件事我们要提出来商量。