Subject + 就任 + Position
The verb 就任 (jiùrèn) means "to take office" or "to assume a position." It is used in formal contexts to describe someone officially beginning a role or appointment. For example, 就任总统 means "to take office as president."
新市长下周一正式就任。
xīn shì zhǎng xià zhōu yī zhèng shì jiù rèn.
The new mayor will officially take office next Monday.
她就任公司总裁已经三年了。
tā jiù rèn gōng sī zǒng cái yǐ jīng sān nián le.
She has been serving as company president for three years now.
他就任大使后第一次访问了邻国。
tā jiù rèn dà shǐ hòu dì yī cì fǎng wèn le lín guó.
After taking up his post as ambassador, he visited the neighboring country for the first time.