Used to connect two parallel, complementary situations, motivations, or objectives ('on the one hand..., on the other hand...' / 'partly to..., partly to...').
'关键' denotes the decisive pivot or crux upon which success or failure hinges ('the key lies in...', 'the crucial factor is...').
Pronoun meaning 'each other' or 'mutually'; colloquially repeated as '彼此,彼此' (Same to you / We are in the same boat) as a gracious conversational response.
Serves as an intensive degree complement, describing quarrels, fights, or frantic work reaching an uncontrollable, inextricably entangled fever pitch ('hopelessly embroiled in', 'frantically swamped').
Expresses that a certain condition, feeling, or realization intensifies in direct proportion to the progression of another ('the more..., the more...').
Emphatically conveys that a concern or precautionary measure is wholly unwarranted and superfluous ('entirely unnecessary', 'there is really no need to').
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