1. enter- (inter-) + -tain + -ing.
2. => keep or hold someone's mind among many different and interesting things.
=> keep or hold something like amusing or treat between / among people.
=> keep or hold something attractive or interesting among / in one's mind.
3. 所谓花花世界、五彩缤纷、其乐无穷，由此引申义：娱乐，助兴。
4. 类推：The original Old French version of enterprise was emprise.
5. => The original Old French version of entertain was *emtenir(*emtain).
6. 因此这里的enter-前缀应该说还含有“in”的含义，这还可以从单词enter及该前缀的源头可以看出来。
7. enter- "in" => hold or keep one's mind in something, hold (in), keep (in), maintain (in).

1. They rose to the challenge of entertaining 80 school-children for an afternoon.

他们一个下午成功接待了80名学童。

来自柯林斯例句

2. Miro is the most inventive and entertaining of surrealist painters.

米罗是最具创造力和娱乐性的超现实主义画家。

来自柯林斯例句

3. To generate new money the sport needs to be more entertaining.

要想创造更多的收入，这项体育活动需要变得更加有趣味性。

来自柯林斯例句

4. This is actually a very entertaining book putting over serious health messages.

这实际上是一本非常有趣的书，讲述了大量的健康知识。

来自柯林斯例句

5. This is an entertaining yet thought-provoking film.

这部电影令人捧腹，却又发人深省。

来自柯林斯例句