overrun：
*1.蔓延, 占领, 侵害, 蹂躏
Because the kitchen was dirty, it was overrun by insects.
由于厨房脏, 所以害虫在那里大量出没。
* 2.超过(范围)
The advertising department has overrun its budget three years in row.
广告部的开支已经连续三年超过预算。
* 3.（尤指坏事或不欲之事）泛滥；横行；肆虐
* 4.多用（时间、钱财等）；超时
overflow：
*1.溢出; 淹没
The milk is overflowing.
牛奶溢出来了。
The flood overflowed the valley.
洪水淹没了河谷。
* 2.充满
He always fills his glass till it overflows.
他总是把杯子斟得很满。
The goods overflowed the warehouse.
货仓里装满了货物。
由次可见，overrun只要是某物(如数值)超过一定的范围，而overflow侧重表示某物(如液体)满了、溢出了，
*1.蔓延, 占领, 侵害, 蹂躏
Because the kitchen was dirty, it was overrun by insects.
由于厨房脏, 所以害虫在那里大量出没。
* 2.超过(范围)
The advertising department has overrun its budget three years in row.
广告部的开支已经连续三年超过预算。
* 3.（尤指坏事或不欲之事）泛滥；横行；肆虐
* 4.多用（时间、钱财等）；超时
overflow：
*1.溢出; 淹没
The milk is overflowing.
牛奶溢出来了。
The flood overflowed the valley.
洪水淹没了河谷。
* 2.充满
He always fills his glass till it overflows.
他总是把杯子斟得很满。
The goods overflowed the warehouse.
货仓里装满了货物。
由次可见，overrun只要是某物(如数值)超过一定的范围，而overflow侧重表示某物(如液体)满了、溢出了，
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