In 1938, it was discovered that when nuclear particles called neutrons were fired at uranium atoms, they would split, or break in two.

1938年，人们发现，当被称为中子的核粒子撞击铀原子时，铀原子会分裂或破裂成两半。

The U. N.'s nuclear watchdog has sent a delegation to the Iran's capital, aiming to clarify outstanding issues linked to the nuclear particles discovered at Iranian nuclear sites.

联合国核监督机构已派出一个代表团前往伊朗首都，旨在澄清与在伊朗核设施发现的核粒子有关的悬而未决的问题。