it remains to be seen
Something is not yet clear, certain, or known. We can see for ourselves the disaster's immediate impact, but it remains to be seen what the long-term environmental effects will be. Of course, it remains to be seen whether the president's popularity on other issues will carry over into this more controversial endeavor. The movie is critically acclaimed, but it remains to be seen if it can attract the average moviegoer.
remain to be seen
To not yet be clear, certain, or known. We can see for ourselves the disaster's immediate impact, but the long-term environmental effects remain to be seen. Of course, it remains to be seen whether the president's popularity on other issues will carry over into this more controversial endeavor.
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