他补充道：“只有签订双边协议才能互相约束，而且无法轻易的进行单方面取消。”

"A bilateral arrangement will be mutually binding and difficult to withdraw unilaterally, " he added.

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他补充道：“只有签订双边协议才能互相约束，而且无法轻易的进行单方面取消。”

"A bilateral arrangement will be mutually binding and difficult to withdraw unilaterally, " he added.

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