There is no sure remedy for AIDS .

艾滋病没有切实有效的治疗方法。

There is no sure formula for success.

成功并无一定之规.

The (mobile search) market is so diverse, even globally there is no sure business model yet.

（手机搜索）市场非常分散，即使放眼全球也还没有可靠的商业模式。

The fact that China has not yet seen mass popular uprisings like those in Tunisia, Egypt, or Libya is no sure sign of contentedness among the Chinese people.

中国还没有目睹像发生在突尼斯、埃及和利比亚的那种许多人踊跃参与的起义的事实已不再是中国人对现状很知足的不容置疑的标志。

It was no sure thing that this device would succeed at the time, and giving it every chance to (by including something like Flash) would have made sense.

虽然那个时候不能确定这种设备能获得成功，但是它毕竟是给了（包括给FLASH）机会的。

It's no sure thing that the consumer group will get its way in court, of course, but the lawsuit ups the pressure on the fast-food chain over the combination of food and toys that appeal to kids.

当然，消费者团体在法庭上能不能胜诉还不一定，但是这次诉讼对速食连锁中将食物搭售玩来吸引儿童的做法施加了一定的压力。