Bilateral act has the prior determinative force when both sides agree with each other, and for unilateral act, it just needs declaration of will of one side.
双方行为必须在双方当事人意思表示一致的情况下才能具有先定力，而单方行为只需有一方的意思表示即可生效。
Bilateral act has the prior determinative force when both sides agree with each other, and for unilateral act, it just needs declaration of will of one side.
双方行为必须在双方当事人意思表示一致的情况下才能具有先定力，而单方行为只需有一方的意思表示即可生效。
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