The conjunction 乃至
We use the conjunction 乃至 
to emphasize the word or phrase that is stated after this conjunction. It is also used to connect the homogeneous members of a sentence.
to emphasize the word or phrase that is stated after this conjunction. It is also used to connect the homogeneous members of a sentence. Pay attention
Homogeneous members of a sentence are words that are associated with the same word and answering the same question. Sometimes they are expressed by the same part of speech.
Examples
这些现象对中国，乃至世界的影响都是惊人的
The impact of these phenomena on China and the world is astonishing
zhè xiē xiànxiàng duì zhōngguó, nǎizhì shìjiè de yǐngxiǎng dōu shì jīngrén de
他的脸色、眼神、乃至一举一动，都被别人看得清清楚楚
His face, his eyes, and even his every move were visible to others
tā de liǎnsè, yǎnshén, nǎizhì yījǔ yīdòng, dōu bèi biérén kàn de qīngqīngchǔchǔ
他熟悉北京，也熟悉巴黎，乃至全世界
He knows about Beijing, he knows about Paris... he actually knows about the whole world
tā shúxī běijīng, yě shúxī bālí, nǎizhì quán shìjiè
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