Thread root diameter
[化] 螺纹内径; 螺纹底径
🧩 词语组成解析
thread
[θrɛd]
n. 线;线索;线状物;螺纹;
vt. 穿成串;将（针、线等）穿过…;用…线缝;给…装入（胶片、狭带、绳子）;
root
[rut]
n. 根，根源;原因，本质;祖先;[乐]和弦基音;
vt. 使生根;使固定;根源在于;欢呼，喝彩;
vi. 生根;根除;
🗣️ 情景例句
I have a client in the garment business, on Seventh Avenue.
我有个客户在Seventh Avenue从事成衣生意。
There's a cool breeze this evening.
今晚有凉爽的微风。
'Can I return these two tickets?' he asked.
“我可以退掉这两张票吗？”他问。