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
How many stamps do I need?
我需要多少邮票？
It is up to you to carry out the plan.
由你实行那个计划。
She is going to set out from the French coast at five o'clock in the morning.
她打算早上5点钟从法国海岸出发。