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
Not until recently.
最近才考虑到。
They that (or who) live longest see most.
活得最长，见识最广。
' The manager was sympathetic, but he could do nothing.
”经理深表同情，但却无能为力。