对于仅仅三个月大的婴儿，他们能够从其它声音中辨认出人类的声音，并能察觉悲伤的情绪。奇怪的是，快乐的声音对他们不起作用。
For at just three months old, babies can tell human voices from other sounds - and work out when someone is sad. Curiously, happy sounds just wash over them.
他们说，日本1990年代的长期衰退已经证明，这种发放现金的作法对刺激需求不起作用。
They say Japan's long recession in the 1990's showed such handouts to be ineffective in stimulating demand.
这几个旅行者拒绝合作，对他们的警告不起作用，因此他们有可能故意这么做，为的是制造国际社会对于伊朗的公众舆论。
The lack of co-ordination on the part of these hikers, particularly after being forewarned, indicates an intent to agitate and create publicity regarding international policies on Iran.
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