The subtraction operators are also available, providing the converse of the add and increment operations.
也可用减号运算符，它的作用与相加和递增操作相反。
NGN could provide more abundant operations, took more increment operations and created more profit, so NGN advanced higher demands for CODEC.
NGN能够提供更加丰富的业务、给运营商带来更多的增值业务，创造更多的利润，同时对CODEC也提出了更高的要求。
Otherwise, if two threads tried to execute the increment simultaneously, an unlucky interleaving of operations would result in the counter being incremented only once, instead of twice.
否则，如果两个线程试图同时执行增加，操作的不幸交叉将导致计数器只被实现了一次，而不是被实现两次。
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