《后汉书·列传·儒林列传下》
适值《颜氏》博士有缺，张玄试策得第一名，授为博士。
会《颜氏》博士缺，玄试策第一，拜为博士。
It happened that the "Yan family" doctor had a vacancy, and Zhang Xuan's strategy test won the first place, and he was awarded the title of doctor.
<s>[INST] Kindly elucidate the central themes in this passage in English: 会《颜氏》博士缺，玄试策第一，拜为博士。 [/INST] It happened that the "Yan family" doctor had a vacancy, and Zhang Xuan's strategy test won the first place, and he was awarded the title of doctor.</s>
Kindly elucidate the central themes in this passage in English: 会《颜氏》博士缺，玄试策第一，拜为博士。
user
It happened that the "Yan family" doctor had a vacancy, and Zhang Xuan's strategy test won the first place, and he was awarded the title of doctor.
assistant