15 sentences

1. 老师在课堂上讲解了这道难题。

   lǎo​shī zài kè​táng shàng jiǎng​jiě le zhè dào nán​tí.

   The teacher explained this difficult problem in class.

   Source: Dong Chinese Dictionary

2. 老师在课上讲解了英语的被动态。

   lǎo​shī zài kè shàng jiǎng​jiě le Yīng​yǔ de bèi dòng tài.

   The teacher explained the passive voice in English during the lesson.

   Source: Dong Chinese Dictionary

3. 导游正在为游客讲解景点的历史。

   dǎo​yóu zhèng​zài wèi yóu​kè jiǎng​jiě jǐng​diǎn de lì​shǐ.

   The tour guide is explaining the history of the attraction to the tourists.

   Source: Dong Chinese Dictionary

4. 老师在语法课上讲解了主、谓、宾的结构。

   lǎo​shī zài yǔ​fǎ​kè shàng jiǎng​jiě le zhǔ, wèi, bīn de jié​gòu.

   The teacher explained the subject-verb-object structure in the grammar class.

   Source: Dong Chinese Dictionary

5. 他在课上专门讲解了先秦时期的小说家。

   tā zài kè shàng zhuān​mén jiǎng​jiě le xiān Qín shí​qī de Xiǎo​shuō​jiā.

   In class, he gave a special lecture on the novelists of the Pre-Qin period.

   Source: Dong Chinese Dictionary

6. 老师在课上详细讲解了李商隐的《细雨》一诗。

   lǎo​shī zài kè shàng xiáng​xì jiǎng​jiě le Lǐ Shāng​yǐn de《 xì​yǔ》 yī shī.

   The teacher gave a detailed explanation of Li Shangyin's poem 'Fine Rain' in class.

   Source: Dong Chinese Dictionary

7. 他指着书上的那张图，开始给大家详细讲解。

   tā zhǐ zhe shū shàng de nà zhāng tú, kāi​shǐ gěi dà​jiā xiáng​xì jiǎng​jiě.

   He pointed at the illustration in the book and began to explain it in detail.

   Source: Dong Chinese Dictionary

8. 教授正在台上讲解先秦农家提倡的生产方式。

   jiào​shòu zhèng​zài tái shàng jiǎng​jiě xiān Qín Nóng​jiā tí​chàng de shēng​chǎn fāng​shì.

   The professor is on stage explaining the production methods advocated by the pre-Qin School of Agronomists.

   Source: Dong Chinese Dictionary

9. 在古代汉语课上，老师讲解了德字在反切中的用法。

   zài gǔ​dài Hàn​yǔ kè shàng, lǎo​shī jiǎng​jiě le dé zì zài fǎn qiè zhōng de yòng​fǎ.

   In the Ancient Chinese class, the teacher explained the use of the character '德' in fanqie.

   Source: Dong Chinese Dictionary

10. 在数学课上，老师正在讲解如何计算一个数字的平方。

    zài shù​xué kè shàng, lǎo​shī zhèng​zài jiǎng​jiě rú​hé jì​suàn yī gè shù​zì de píng​fāng.

    In math class, the teacher is explaining how to calculate the square of a number.

    Source: Dong Chinese Dictionary

11. 在历史课上，老师详细地讲解了红军长征的那段历史。

    zài lì​shǐ kè shàng, lǎo​shī xiáng​xì de jiǎng​jiě le Hóng​jūn cháng​zhēng de nà duàn lì​shǐ.

    In history class, the teacher gave a detailed explanation of the Red Army's Long March.

    Source: Dong Chinese Dictionary

12. 教授在哲学课上讲解了惟心主义与惟物主义的区别。

    jiào​shòu zài zhé​xué kè shàng jiǎng​jiě le wéi​xīn​zhǔ​yì yǔ wéi​wù​zhǔ​yì de qū​bié.

    The professor explained the difference between idealism and materialism in the philosophy class.

    Source: Dong Chinese Dictionary

13. 我正在学习易经，今天老师详细讲解了坎这一卦的含义。

    wǒ zhèng​zài xué​xí Yì​jīng, jīn​tiān lǎo​shī xiáng​xì jiǎng​jiě le kǎn zhè yī guà de hán​yì.

    I am studying the I Ching, and today the teacher explained the meaning of the Kan hexagram in detail.

    Source: Dong Chinese Dictionary

14. 教授在课堂上深入浅出地讲解了太极阴阳转化的道理。

    jiào​shòu zài kè​táng shàng shēn​rù​qiǎn​chū de jiǎng​jiě le Tài​jí yīn​yáng zhuǎn​huà de dào​li.

    In class, the professor explained the principles of Yin and Yang transformation in Tai Chi in simple and accessible terms.

    Source: Dong Chinese Dictionary

15. 老师在课堂上讲解了如何通过配方来解一元二次方程。

    lǎo​shī zài kè​táng shàng jiǎng​jiě le rú​hé tōng​guò pèi​fāng lái jiě yī​yuán'èr​cì fāng​chéng.

    The teacher explained in class how to solve quadratic equations by completing the square.

    Source: Dong Chinese Dictionary