国有: nationalized, public, government owned, state-owned...
招募: to recruit, to enlist...
不辞而别: to leave without saying good-bye...
日期: date...
运算: to perform calculations, (mathematical) operation...
密封: to seal up...
掌握: to grasp (often fig.), to control, to seize (initiative, opportunity, destiny), to master, to know well, to understand sth well and know how to use it, fluency...
水果: fruit...
受罪: to endure, to suffer, hardships, torments, a hard time, a nuisance...
结冰: to freeze...
