Fluted drill
[机] 开构钻
🧩 词语组成解析
a. 笛声的, 有凹槽的
drill
[drɪl]
n. 操练;钻头;军事训练;（应对紧急情况的）演习;
vt.& vi. 钻（孔）;打（眼）;操练;训练;
vt. 作…演习，操练;
🗣️ 情景例句
Well, Grandpa will be disappointed, too.
爷爷也会感到失望。
Don't forget to write your return address on the letter.
不要忘记在信封上写你的回邮地址。
Don't worry.
别担心。