adv.同时地；同步地
Both numbers may slide synchronously in opposite directions. 两数可以同步地向相反方向移位。
The concept used is that the bits of the two numbers to be added are made available to the adder synchronously. 所用的方法是，将相加两数的各位同步地输入到加法器中。
n.异步；不同时
=asynchrony.
