At least, they have done so until now.
至少到现在他们还这么做。
At least, it has seemed so until now.
至少，迄今为止似乎还是这样的。
Or, at least, they have not been able to do so until now.
至少到目前为止它们还不具备这样一种能力。
Unfortunately, such distant spirals look so small and faint that no one has ever done so – until now.
不幸的是，这样遥远的螺旋星系看起来是那么小，那么模糊，直到现在都没人能做到这一点。
Unfortunately, such distant spirals look so small and faint that no one has ever done so – until now.
不幸的是，这样遥远的螺旋星系看起来是那么小，那么模糊，直到现在都没人能做到这一点。
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