a fall-off in sth
最常与 in 连用，后接出现下降的具体领域，如需求、销售、产量等。
There has been a fall-off in demand for electric scooters.
下降；减少
先理解核心含义，再看它在真实句子里的用法。
下降；减少
fall-off
The store experienced a significant fall-off in customers after the new mall opened nearby.
新购物中心在附近开业后，这家商店的顾客人数显著下降。
用法提示：fall-off 是名词，表示顾客数量的减少。
There was a sudden fall-off in temperature when the cold front moved through the area.
冷锋经过该地区时，气温突然下降。
用法提示：fall-off 作名词，指气温的下降。
The teacher noticed a steady fall-off in homework quality as the semester progressed.
随着学期的推进，老师注意到作业质量持续下降。
用法提示：fall-off 为名词，表示质量的下滑。
最常与 in 连用，后接出现下降的具体领域，如需求、销售、产量等。
There has been a fall-off in demand for electric scooters.
电动滑板车的需求出现了下降。
of 后面接具体的下降数量或幅度。
The survey recorded a fall-off of 8 percent in exports.
这项调查记录到出口下降了8%。
常受 sharp、steep、marked 等形容词修饰，说明降幅明显。
Tourism suffered a sharp fall-off after the storm.
暴风雨过后，旅游业急剧下滑。
grammar · medium
易错句子Sales fell-off sharply in the second half of the year.
正确表达Sales fell off sharply in the second half of the year.
fall off 作动词短语时两个词分开写、不加连字符；连字符形式 fall-off 只作名词。这里 fell 是动词，所以应写成 fell off。
grammar · medium
易错句子There was fall-off in demand after the price increase.
正确表达There was a fall-off in demand after the price increase.
fall-off 是可数名词，单数形式前必须有冠词或其他限定词，不能像不可数名词那样单独使用，因此要加 a。
grammar · medium
易错句子We saw a fall-off of tourist numbers this summer.
正确表达We saw a fall-off in tourist numbers this summer.
表示“在某方面的下降”时，fall-off 后接介词 in，不接 of；in 引出下降所涉及的领域。
drop-off 与 fall-off 意思最接近，常可互换，但 drop-off 更口语化，还常指“（用车）送到、放下”这一具体动作；fall-off 只表示数量或程度的下降。
fallout 与 fall-off 拼写、读音相近，但意思不同：fallout 指事件造成的不良后果或放射性尘埃，不表示数量下降；不要因形近而误用。
decline 也可表示下降，但更正式、适用范围更广，可作动词和名词，还能表示“婉言谢绝”；fall-off 只作名词，多指某一时期内具体数量的减少。
down + fall
fall + out
fall + back
rain + fall
snow + fall
water + fall
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