The problem of collecting and delivery shunting of non-through wagon flow on the actinoid private line belongs to a kind of the combinatorial optimization problems.
放专用线非直达车流取送车属于一类组合优化,因素较多。
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Harry felt scared to see him walking along, undefended, shieldless; he wanted to cry out a warning, but his headless guard kept shunting him backwards towards the wall, blocking his every attempt to get out from behind it.
,哈利看到他一个人毫无防备地走着,也没有任何护体东西;他真想大喊一声提醒邓布利多小心,但是那个无头卫士还在保护着他,继续把他推向后面墙根,他根本没法从它后面出来。