证明是...

Some of them have turned out to be very helpful.

其中一些人已被证明是非常有益的。

The solitary years proved to be fruitful, for in 1837, he published Twice-Told Tales, a collection of short stories which attracted critical attention.

孤年证明是富有成效的，为1837年，他发表了两次告诉故事，短篇小说集吸引了危急的注意。

Your method tying the hat was proved to be efficient.

你的绑紧帽子的方法被证明是有效的。

Accord- ing to the observation that the compounds were stable in low pH aqueous solution and their sta- bility decreased when pH increased, and they rapidly decomposed to form α-methylenecyclopen- tanones derivative when pH reached 6 to 7, we postulated that the compounds were unabsorbable in stomack (where pH1-3) and unstable in small intestine (where pH5-8). The decomposed product was indeed inactive.

对Ⅰ类化合物在稀溶液中的稳定性研究表明，低pH时化合物较稳定，随着pH值的升高稳定性逐渐降低，pH6~7时，化合物迅速分解成α-亚甲基环戊酮类化合物，由此而推测Ⅰ类化合物经口给药无效的原因为：它们在强酸性的胃中（pH1-3）呈离子状态，因而不易吸收，经胃的排空运动进入肠道后，随着pH逐渐升高（pH5-8）化合物迅速分解，而分解产物α-亚甲基环戊酮类化合物证明是无效的。

If your email address proves to be invalid or such transmissions are returned to us as undeliverable, your

如果您的电子邮箱地址被证明是无效的，或者如果我们的电子邮件传递因为无法送达以至被退回，您注

This service didn't last long as cats proved to be thoroughly undisciplined.

但这项服务并没有持续太久，因为猫被证明是完全不遵守纪律的。

If distracted people given high control still perform better than undistracted ones, then the motivation account will be supported.

如果人在受干扰以及高控制度情况下仍能做出高品质的决策，那麼动机理论就可以被证明是正确的。

It requires not merely the acquisition of more technology and knowledge, an enterprise in which we have proven unequaled.

这不仅仅需要掌握更多的知识与技术--这些知识与技术已经被证明是我们人类一个无双的伟大成就--它同样需要知识王冠上的那颗宝石，作为一个道德的指南针，为知识和科技提供发展的方向和目的。

I can discard that which is unfitting, and keep that which proved fitting

我可以摒弃那些不合适的，保留那些被证明是合宜的东西

The internet has proved to be an "ungoverned space" where al-Qaeda and its followers have thrived.

网络已经被证明是"无管制空间"，在那里，基地组织及其追随者们茁壮成长。4月23日，英国一个法庭开始对被控在国外煽动恐怖主义的三个人的开庭审讯。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷