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Well, we start out with our usual system, and we have a bunch of little pebbles on it.
还是那个系统，活塞上面放了很多小石子。
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We remove a pebble, system expands.
移开一粒小石子，系统膨胀一点。
应用推荐
$firstVoiceSent
- 来自原声例句