到目前为止，我们还不知道这个问题的严重性。
不幸的是，到目前为止，还没有一种简单的方法可以让我们知道水什么时候将被完全净化。
Unfortunately, until now, there was no simple way of knowing when the water was purified.
到目前为止，我们很少知道这些癌细胞如何保持生长和进化。
Until now, we knew very little about how these cancer cells kept growing and evolving.
到目前为止我们仅知道，城邦最广泛的特色。
At this point we know only the most general features of what a polis is.
到目前为止，我们对我们的成绩感到高兴，但是我们知道我们可以做的更好。
We are happy for what we have done so far, but we know we can do even better.
到目前为止，我们对我们的成绩感到高兴，但是我们知道我们可以做的更好。
We are happy for what we have done so far, but we know we can do even better.
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