Both regimes are setting long-term targets, sending a market signal well beyond 2012 as they both acknowledge a need for market-based mechanisms.
这两个交易体系正在制定长期目标，传递出一个2012年后的市场信号，而且他们也都承认需要有市场机制。
2
Apple will undoubtedly acknowledge that holding the iPhone 4 does affect the signal.
毫无疑问，苹果将会承认手握iphone4的确会影响到信号。
3
In this case, the receiver of the request subaction generates a 'pending acknowledge' to signal the requester node that the message has been well received, and that a response subaction will follow.