Die once forming, for fixed window glass.

模具一次成形，用于固定视窗玻璃。

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Scientists once imagined galaxies forming by a sort of monolithic collapse, in which a giant cloud of gas suddenly fell inward.

科学家们曾经想象星系是由某种整体的崩塌形成的，在这个过程中，极大量的气体云突然向内收缩。

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When small fish face an extremely difficult problem-an attack, say, from several predators at once-they deal with it by forming a school.

当小鱼面临极其困难的问题时，比如说，突然遭到几个捕食者的袭击，他们会立刻形成鱼群。

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Michael Petraglia says that in the past, the spot must have been a lush river valley: "There is a major valley across the area which once was a river running westward forming waterfalls and taking water to the low fertile lands west of Al-Magar, " he explains.

BBC: Desert finds challenge horse taming ideas

Once again two camps seem to be forming on American (and thus world) economic prospects.

FORBES: Keeping Faith

They then run policy experiments on the model, asking what policymakers might have done to prevent the bubble forming, or at least stopped it building once it was clear there was one.

FORBES: Traditional Economics And The New Economics