Oncologists must try to outsmart tumors that have already begun to metastasize.是什么意思？

Oncologists must try to outsmart tumors that have already begun to metastasize.

癌病医生们必须采取更有效的办法来对付肿瘤的转移.

must

aux. 必须，必然要，（做出逻辑推断），（表示坚持）；n. 必须做的事，必不可少的事物，葡萄汁，霉臭，麝香；vt.& vi. （表示必要或很重要）必须，（提出建议）应该，得，（表示很可能或符合逻辑）一定；adj. 不可或缺的，狂暴的；

例句
Some parents believe a boy must learn to stand up and fight like a man.
有些父母认为男孩子必须学会像男子汉一样顶天立地，勇于抗争。

try

vt.& vi. 试图，努力，实验，审判，考

例句
He stopped to try to adjust his vision to the faint starlight...
他停下脚步试着让眼睛适应微弱的星光。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

outsmart

--

例句
Oncologists must try to outsmart tumors that have already begun to metastasize.
癌病医生们必须采取更有效的办法来对付肿瘤的转移.

tumors

--

例句
These tumors are biologically benign and are treated by curettage or resection.
生物学上这些肿瘤为良性且可通过刮除术或切除术治愈.

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

have

aux. 用以构成完成式及完成式的不定式，表示已经…；vt. 有，具有，拿，取得，从事，必须，不得不；n. 〈口〉有产者，有钱人，富国，〈英俚〉欺骗，诈骗；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

already

adv. 早已，已经，先前；

例句
He has already voted by absentee ballot...
他已进行了缺席投票。

begun

n. [人名] 贝根，[地名] [印度] 贝贡；v. 开始（begin的过去分词）；

例句
The women who worked in these mills had begun to agitate for better conditions.
在这些工厂里做工的妇女们开始抗议要求改善工作条件。

metastasize

vi. 转移；

例句
Cancer cells metastasize through the body.
癌细胞蔓延全身.