3 sentences

1. 力的大小通常用牛顿来衡量。

   lì de dà​xiǎo tōng​cháng yòng niú​dùn lái héng​liáng.

   The magnitude of force is usually measured in Newtons.

   Source: Dong Chinese Dictionary

2. 牛顿（Newton）作为姓氏，在英国非常普遍。

   Niú​dùn(Newton) zuò​wéi xìng​shì, zài Yīng​guó fēi​cháng pǔ​biàn.

   As a surname, Newton is very common in Britain.

   Source: Dong Chinese Dictionary

3. 在物理课上，同学们正在认真地讨论牛顿的力学定律。

   zài wù​lǐ kè shàng, tóng​xué men zhèng​zài rèn​zhēn de tǎo​lùn Niú​dùn de lì​xué dìng​lǜ.

   In physics class, the students are earnestly discussing Newton's laws of mechanics.

   Source: Dong Chinese Dictionary