2 sentences

1. 许多国家都在讨论核子能源的安全问题。

   xǔ​duō guó​jiā dōu zài tǎo​lùn hé​zǐ néng​yuán de ān​quán wèn​tí.

   Many countries are discussing the safety issues of nuclear energy.

   Source: Dong Chinese Dictionary

2. 原子核是由质子和中子这两种核子构成的。

   yuán​zǐ​hé shì yóu zhì​zǐ hé zhōng​zǐ zhè liǎng zhǒng hé​zǐ gòu​chéng de.

   The atomic nucleus is composed of two types of nucleons: protons and neutrons.

   Source: Dong Chinese Dictionary