ประโยคภาษาจีน : 中文句子 |
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zài 在 shì jì 世纪 cháo xī 潮汐 zhèn dàng 振荡 hé shēng 和声 zhòng lì 重力 zhèn dàng 振荡 de 的 lǐ lùn 理论 céng jīng 曾经 shì 是 ráo yǒu xìng qù 饶有兴趣 de 的 kè tí 课题 |
During the 19th century, the theories of tidal and acoustic gravity oscillations were subjects of great interest. |