而且把关税作为谈判的筹码也并非没有先例。
There are also precedents for using tariffs to back up negotiations.
他重申他的立场，认为核子武器不可以用来当作国际谈判的筹码。
He re-stated his position that nuclear weapons should not be used as an international bargaining chip.
他一再重申他的立场，认为核子武器不可以用作当作国际谈判的筹码。
He reiterated his position that nuclear weapons could not be used as international bargaining chips.
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