“我们仍不明白引起这些差异的原因，但我们计划下年来研究这个问题，”他说。

"We don't yet know why these differences occurred, but plan to studyit in the next year, " he said.

youdao

7个碳的庚烷引起不明原因引擎抽风。炼油厂尝试混入更多的8个碳的辛烷。

Of these, heptane with 7 carbons causes undesirable engine knocking, so refiners try to blend in more smooth-burning octane with 8 carbons.

youdao

你不应该感到羞愧或害怕，因为你没有什么可担心的——你真的不明白引起问题的的原因。

You shouldn't be ashamed or afraid, because you have nothing to fear - you really do not understand the causes of a problem.

youdao