Effective use of energy sources
[经] 有效利用能源
🧩 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
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
n. 输入源；发起者；来源（source的复数）
🗣️ 情景例句
I'm not sure. I'll have to check.
我不能确定，我必须查一下。
What sort of guarantees are there against late delivery?
惩罚延迟发货有什么保证呢？
If a shop assistant told him she had not heard of it, he would pretend to be considerably put out.
要是女售货员告诉他从未听说过这些东西，他会装出十分遗憾和不安的样子。