高考结束可以用以下几种英语表达方式：

1. "The college entrance exam is over."

2. "The gaokao is over."

3. "The university entrance exam is over."

4. "The National Higher Education Entrance Examination is over."

5. "The National College Entrance Examination is over."

建议根据具体的语境选择合适的表达方式。例如，在正式的书面语或报告中，使用"The National College Entrance Examination is over."可能更为准确和正式。在口语交流中，"The college entrance exam is over."或"The gaokao is over."可能更为自然和常用。