Effective diameter
[机] 有效直径
🧩 词语组成解析
effective
[ɪ'fɛktɪv]
adj. 有效的;起作用的;实际的，实在的;给人深刻印象;
n. [军]现役兵额，有生力量，精兵;
ef出+fect做，制作 +ive形容词后缀 →做出来的 → 有效的
🗣️ 情景例句
He won't pay attention to anybody.
他不会认真倾听别人的话。
Don't tell anyone that I did it.
别说是我做的。
No, I think it'll be all right for him to go to school.
不，我想他去上学没什么关系。