词源同上的英文：
explaination

explain puzzles
解释难题

Explain the advantages and disadvantages of globalization.
解释全球化的优缺点。

Rita and Frank explain all...
丽塔和弗拉克说出了一切……

I cannot explain why.
我说不出理由。

The theorem may be explained as follows.
这条原理可以这样来阐述。