1. enter- (inter-) + -tain.
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).
8. 进入一种拿在手里玩的状态.

entertain 招待

enter-, 更里面，中间。-tain, 握，维持，词源同contain, tenable. 即招待客人，维持客户。

1. I wouldn't entertain the idea of such an unsociable job.

我不会考虑从事这种不跟人打交道的工作。

2. I feel how foolish I am to entertain doubts.

我竟然心存怀疑，真是太愚蠢了。

3. Michael left his sickbed to entertain his house guests.

迈克尔走下病床去招待客人。

4. She had to entertain some boring local bigwigs.

她不得不款待当地一些无聊的大人物。

5. The television programme is designed to educate and not merely to entertain.

这个电视节目不仅是为了娱乐而且是为了教育而设计的.