目前还不清楚为什么有些暗物质团簇尽管尺寸足够大但是并没有形成星系。
It's not clear why some dark matter clumps won't form galaxies despite their ample size.
一旦确定目标用户和平台，开发者就需要花点时间搞清楚输入方式和屏幕设备尺寸。
Once the audience and platform(s) are determined, the developer should take some time and understand the input methods and screen device dimensions.
这是一次真正全新的设计，这架飞机的尺寸规格与空客公司的飞机相同，重量上相当于一辆中型汽车。因此我们如果没有全面深入地搞清楚的话，绝不会贸然尝试。
This is truly a new design - an airplane the size of an Airbus and the weight of a mid-sized car - so we're not taking risks by not understanding something.
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