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The gravitational fields required to make such a closed time-like curve would have to be very strong,"on the order of what you might find close to a black hole," Ori told LiveScience."We don't have any way of creating such strong gravitational fields today, and we certainly have no way of manipulating any such gravitational fields."

要制造出这样一条封闭时间曲线的引力场非得要非常强，"大约和你在一个黑洞附近找到的那么大"Ori告诉LiveScience"我们现在没有任何办法来制造这么强大的引力场，而且，可以肯定地说，我们无法来控制任何一个这样的引力场"

Lake Arenal is open to fishing throughout the year, but is a closed season in most inland waters, and a valid Costa Rican fishing license is required for freshwater fishing in the country.

arenal湖一年四季均可钓鱼，但多数是一个封闭的内陆水域的季节，哥斯达黎加和有效所需淡水渔业捕捞许可证的国家。

A simple way to construct a function separating a point from a closed set ( as required for a

构造分离一个点与一个闭集的函数

A common low-cost, internally frequency-compensated op amp is chosen; it has the required bandwidth at a closed-loop gain of 10, and it would seem to meet the bill.

选择一个普通的带有内部频率补偿的低价运放，它在闭环增益为10时具有所要求的带宽，并且看起来满足了价格要求。

This is the necessary closure that is required to shift the direction and frequency of your existence.

为了转变你们的存在的方向和频率，这是那必要的终结。

The Senator passed out, but remembering the old people, visited a clothier and shoe man, and, finding that he could only guess at what sizes might be required, ordered the several articles with the privilege of exchange.

参议员走出店门，才记起了他们两老，就又去找估衣店和鞋子店，却因不晓得尺寸，所以言明定买的各件都可以退换。

Madonna wrote the script herself, so a tolerance for cloying sentimentality is required :'People often ask me why I chose Malawi.

麦当娜自己写剧本，因此，在感情上就一定不能出现厌烦：''人们总是问我为什么会选择马拉维。

Is required in the process of blood coagulation in animals important material.

是动物体凝血过程中所需的重要物质。

For molasses meal trial,the conclusions show that 50% molasses can well absorbed by corn cob meal in Molasses Meal,and mould inhibitor also required in this kind of product.

糖蜜粉的研制结果表明：糖蜜的添加量可以达到50％，最佳的糖蜜载体为玉米芯粉，需加入双乙酸纳等防霉剂，该产品可以满足配合饲料加工的要求并能达到一定的贮存期限。

Results of this study indicated cultured cobia required sea water temperature higher than 14℃.

这些结果指出海鲡一定要养殖在全年最低海温14℃以上的海域。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。