扫描雷达的最优视频积累器因运算量大而难以实时实现。
Requiring a large number of arithmetic operations, the optimal video integrator for scanning radars is difficult to implement in real time.
对于为什么这些用于帮助增加词汇量的视频无益于词汇积累，Zimmerman只能推测。
As for why the videos hurt vocabulary when they're supposed to help it, Zimmerman can only speculate.
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