4 sentences

1. 小事是有累积效应的。

   xiǎo​shì shì yǒu lěi​jī xiào​yìng de.

   Small things have a cumulative effect.

   Source: CCMatrix

2. 随着岁月的推移，屋子里累积了很多书。

   suí​zhe suì​yuè de tuī​yí, wū​zi li lěi​jī le hěn​duō shū.

   In the course of the years many books had accumulated in the house.

   Source: UM-Corpus: Education

3. 我舅舅和舅妈靠储蓄累积了一笔财富。

   wǒ jiù​jiu hé jiù​mā kào chǔ​xù lěi​jī le yī​bǐ cái​fù.

   My uncle and aunt accumulated a fortune by saving their money.

   Source: UM-Corpus: Education

4. 如果没有适当的睡眠，有害的废物就会开始在您的大脑中累积。

   rú​guǒ méi​yǒu shì​dàng de shuì​mián, yǒu hài de fèi​wù jiù huì kāi​shǐ zài nín de dà​nǎo zhōng lěi​jī.

   Without proper sleep, harmful waste begins to accumulate in your brain.

   Source: CCMatrix