What's happened is that the new results narrow down the possibilities.

现有的情况是，新的结果缩小了可能性的范围。

If you can narrow down this list, you should.

如果可以缩减列表，应该尽量缩减。

Narrow down what you do, and do it repeatedly.

限定你要做的事，反复的做。

The test could narrow down the range of possible suspects.

这一技术可缩小可能的嫌疑犯的范围。

If this summary doesn't narrow down your decision, don't worry.

如果这个小结仍然无法缩小决策范围，那么不要担心。