Its initial opacity will be zero, which is fully transparent.
它的初始不透明度是0，即完全透明。
And we've also assumed an initial time, which usually we can just call zero.
还假定了一个初始时间，初始时间一般都可以设成零。
零为起始值。
We set "tel" to the initial value of zero.
我们将“tel”的初值设置为0。
We set "tel" to the initial value of zero.
我们将“tel”的初值设置为0。
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