However, it may be that we still have a long way to go before we have a "clean" world.
然而，在我们有一个“干净”的世界之前我们还有很长的路要走。
We have made some progress, but we still have a long way to go.
我们虽然取得了些进步，但还是远远不够的。
Though we still have a long way to go, we are full of confidence in the future.
虽然我们还有许多困难要克服，但是我们对未来布满信心。
Though we still have a long way to go, we are full of confidence in the future.
虽然我们还有许多困难要克服，但是我们对未来布满信心。
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