5 sentences

1. 这种断言缺乏事实依据。

   zhè zhǒng duàn​yán quē​fá shì​shí yī​jù.

   Such assertions lack factual basis.

   Source: Dong Chinese Dictionary

2. 他的判断缺乏科学依据。

   tā de pàn​duàn quē​fá kē​xué yī​jù.

   His judgment lacks a scientific basis.

   Source: Dong Chinese Dictionary

3. 这个说法纯属谣言，没有任何事实依据。

   zhè​gè shuō​fa chún​shǔ yáo​yán, méi​yǒu rèn​hé shì​shí yī​jù.

   This statement is pure rumor and has no factual basis.

   Source: Dong Chinese Dictionary

4. 在古代，观测五星的运行是制定历法的重要依据。

   zài gǔ​dài, guān​cè wǔ​xīng de yùn​xíng shì zhì​dìng lì​fǎ de zhòng​yào yī​jù.

   In ancient times, observing the movement of the five planets was an important basis for creating calendars.

   Source: Dong Chinese Dictionary

5. 依据最新规定，我们需要重新填写表格。

   yī​jù zuì​xīn guī​dìng, wǒ​men xū​yào chóng​xīn tián​xiě biǎo​gé.

   According to the latest regulations, we need to fill out the form again.

   Source: Dong Chinese Dictionary