We cannot and should not act alone.
我们不能也不应独自行动。
Mr Sarkozy did not act alone, of course.
萨科齐当然并非单独行动。
The Americans say they act alone because the ISI fails to co-operate.
美国人说他们要单独行动，因为三军情报局未能进行合作。
But in a world in which threats are more diffuse, and missions more complex, America cannot act alone.
然而，在这个威胁日益蔓延、使命日趋复杂的世界里，美国不能独自行动。
We no longer have to act alone.
我们不必再单枪匹马。
They often act alone or as a pair and make a different kind of fun.
他们通常是独自表演或者成对表演，表现出一种不同的乐趣。
But they also made it clear that they are willing to act alone, if necessary, to pass a health care bill.
但是他们也表明，如果必要的话，他们将会独自通过医改法案。
The United States, however, preferred to act alone, picking allied units in "coalitions of the willing" to go to war in Afghanistan.
然而，美国更喜欢单独行动，以“自愿联合”原则挑选联盟单位，开赴阿富汗战场。
Regardless of whether these hormones contribute to obesity and eating disorders or are affected by them, do they act alone or in concert?
不管这些激素是否会导致或影响肥胖问题和饮食失调，现在的疑问是它们是单独起作用呢还是共同起作用？
At times, water pollutants or excess ultraviolet radiation may act alone to cause specific problems, such as disfigured bodies and eye or skin abnormalities.
有时，水污染物质或过量的紫外线可能各自造成特定的问题，如身体变形与眼睛或皮肤的病变。
For example, in a situation in which several bystanders need to band together to overwhelm a perpetrator, they will be more likely to act collectively than to act alone.
例如，就有这样一种情况，在只有几个旁观者需要联合起来才能压倒一个罪犯的情况下，他们就可能会更多地采取集体行动。
For example, in a situation in which several bystanders need to band together to overwhelm a perpetrator, they will be more likely to act collectively than to act alone.
例如，就有这样一种情况，在只有几个旁观者需要联合起来才能压倒一个罪犯的情况下，他们就可能会更多地采取集体行动。
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