Aromatic radical
[机] 芳(族)基
🧩 词语组成解析
radical
['rædɪkl]
adj. 根本的，基本的;激进的;彻底的;[植]根生的;
n. 激进分子;根基，原子团;[数学]根数;
radic根+al…的 →根本的，基本的;[转为名词] 根部，基础
🗣️ 情景例句
What made you change your job so frequently?
为什么你经常转工？
How much do you know about the works of Henry Wadsworth Longfellow?
你对亨利·朗费罗的工作知道多少？
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。