Researchers and businesses have responded strongly to the last point. Never have there been so many tools, systems, and programs available for quitting smoking.
科研人员和商家们对最后一点反映最强烈。从来没有一种能够用来戒烟的工具，系统或者工程。
Never have there been so many tools, systems, and programs available for quitting smoking.
从未有过如此众多的工具，制度和程序可用于戒烟。
A number of brain systems have been implicated in addictive behavior, but none have yet been shown to be necessary for maintaining the addiction to cigarette smoking.
我们知道成瘾行为与一些大脑的系统有关，但我们并不知道是什么维持着人对香烟的成瘾性。
A number of brain systems have been implicated in addictive behavior, but none have yet been shown to be necessary for maintaining the addiction to cigarette smoking.
我们知道成瘾行为与一些大脑的系统有关，但我们并不知道是什么维持着人对香烟的成瘾性。
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