Penta-
pref. 表示“五”之义
📖 牛津释义
penta-
comb form 构词成分 having or made up of five of sth 有五个某物; 由五个某物组成
a pentagon * the pentathlon.
🧩 词语组成解析
[美口]五角大楼, 美国国防部
🗣️ 情景例句
Show.
Show。
My brother got up earlier than I did.
与我做了比，我的兄弟早起床了。
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。