3 sentences

1. 三百万不是一个小数目。

   sān bǎi​wàn bù​shì yī​ge xiǎo shù​mù.

   Three million isn't a small amount.

   Source: OpenSubtitles

2. 他们的数目多得足够编成军队。

   tā​men de shù​mù duō de zú​gòu biān chéng jūn​duì.

   There were enough of them to form an army.

   Source: CCMatrix

3. 大脑通过调节这些连结的数目和强度进行学习。

   dà​nǎo tōng​guò tiáo​jié zhè​xiē lián​jié de shù​mù hé qiáng​dù jìn​xíng xué​xí.

   The brain learns by adjusting the number and strength of these connections.

   Source: UM-Corpus: Education