primacy['praim?si]

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首要地位（名詞,，正式用語）

(noun, FORMAL) The state of being first or most important.

EXAMPLE: The economic primacy of heavy industry may be challenged by information technologies in the future.

重工業(yè)在經(jīng)濟上的首要地位未來可能受到信息技術的挑戰(zhàn),。

to let on

泄露秘密（非正式用語）

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(INFORMAL) To reveal a secret.

EXAMPLE: Everyone in the office was careful not to let on about the party planned for their manager's birthday.

辦公室里的每個人都在小心翼翼地保守為經(jīng)理舉行生日聚會的秘密。