Antecedent sign
[医] 前驱征, 先兆征
🧩 词语组成解析
antecedent
['æntə'sidnt]
n. 经历;<数>（比例）前项;<逻>前件;祖先;
adj. 在前的，在先的，先行的;
ante前面，先+ced走+ent...的→走在前面的→前事→先行的，以前的
🗣️ 情景例句
You don't?
你没打？
Please try to be congenial and welcome the guests with a small.
请用笑脸愉快地迎接客人吧。
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。