Pre-conferences
(pre-conference 的复数) n. 预备会议
🧩 词语组成解析
abbr. 炼油工程师（Petroleum Refining Engineer）
n. 会议（conference的复数形式）
🗣️ 情景例句
If there is any cinnamon,
要是有的话，
You can't tell anybody by what they seem.
你不能凭外表判断人。
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。