Technically

嚴格來說 /严格来说

yángé láishuō

(based on precise facts, which however may be contrary to common misbelief or to a traditional name)

在專業上 /在专业上

zài zhuànyè shàng

(having or using the skills or talent required for a certain job or profession)

在技術上 /在技术上

zài jìshù shàng

(having or using the skills or talent required for a certain job or profession)

法律意义上的

(based on formal (de jure) arguments, which however may be misleading)