合同已于今日生效，我们不能反悔了。
The contract comes into effect today, we can't go back on our word now.
合同已于今日生效，我们不能反悔了。
The contract comes into effect today, we can "t go back on our word now."
合同已于今日生效，我们现在不能反悔了。
The contract comes into effect today; we can't go back on our word now.
合同已于今日生效，我们现在不能反悔了。
The contract comes into effect today; we can't go back on our word now.
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