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731部队的性质及其罪恶活动,自始至终被蒙上一条条面纱,不仅让外界看不清,而且不少日本军界对此也摸不清虚实,其原因是它的一切活动都带有隐蔽性。
The nature of the 731 troops and their criminal activities are veiled from beginning to end not only for the outside world to see but also for many Japanese military circles who are unable to get a sense of actuality because all its activities are concealed .