1、under + stand.
2、字面含义：stand in the midst of.
3、站在其中，沐浴在知识的海洋里，所谓内行、内行，身在其中，才解其味也；因此，只有身在其中，才能理解、明白。
4、At here, the under is not the usual word meaning "beneath," but from Old English under, from PIE *enter- "between, among". 另见：undertake.
5、understand => 过去分词：understood.

1. She understood his meaning, if not his words, and took his advice.

她即便没听懂他的话，也明白了他的意思，并且接受了他的建议。

来自柯林斯例句

2. He never understood how to organize or compress large masses of material.

他从来就不懂如何对大篇的材料进行整理或精简。

来自柯林斯例句

3. It is understood he had a blow-up with coach Chris Anderson.

据了解，他和教练克里斯·安德森之间爆发了激烈争吵。

来自柯林斯例句

4. It is understood that the veteran reporter had a heart attack.

据悉，那位资深记者心脏病发作。

来自柯林斯例句

5. The document is expressed in terms that are readily understood and agreed.

文件用语浅显易懂，让人易于接受。

来自柯林斯例句