The classes defined by the acm.program form a hierarchy with a little more structure and complexity than you have seen up to this point.
program定义的一系列类组成了一种比你目前所看到的更复杂的层次结构。
Most importantly, in structuring an extension activity this way, you create a well-defined interface, unlike the generic ones that you've seen up to now.
最重要的是，通过这种方式组织一个扩展活动，您将创建一个定义良好的接口，而不是您此前看到的那些通用接口。
This is something that had never been seen up to now because the painting was always judged to be dark and difficult to examine," he told a news conference.
之前，我们从未发现过这层薄沙，因为人们一直认为这幅画色调暗，不易探查。
But as time passed and I studied it more deeply, I began to see that the fundamental intention of this language was different from other languages I had seen up to that point.
但随着时间的推移，我对它的学习也愈加深入，开始意识到它的基本宗旨与我见过的其他所有语言都有所区别。
Heard they'd been seen up this way.
听说有人看到他们朝这个方向来了。
The first images showed the "Arctic plain" where Phoenix came to rest - a region of Mars that has never been seen up close before.
第一幅图显示的是“凤凰号”所抵达的“北极平原”——火星上的一个从来没有被近距离观察过的区域。
The first images showed the "Arctic plain" where Phoenix came to rest - a region of Mars that has never been seen up close before.
第一幅图显示的是“凤凰号”所抵达的“北极平原”——火星上的一个从来没有被近距离观察过的区域。
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