What doesn't bring down the number of polar bears according to this passage?

根据这篇文章，是什么没有减少北极熊的数量？

youdao

There is nothing magical about the mere passage of time that causes risks to decline in number and severity.

导致风险数量减少风险程度降低的纯粹时间段并不是什么不可思议的。

youdao

Then they would allow about four more for the passage between the two attics in Polly's house, and then the same number for the maid's bedroom as for the box-room.

他们给波莉家两个阁楼间的通道留出稍多于四根椽子的距离，给女佣的卧室算上与储藏室一样多的椽子。

youdao

This passage I read at length is important for a number of reasons let me just try to explain.

我读出这一长段是基于几个重要的理由,我会加以解释。

耶鲁公开课 - 政治哲学导论课程节选

The passage of the AIA drove down the number of defendants named in patent suits, but also drove up the number of suits filed by trolls.

FORBES: Are Patent Trolls Now Zeroed In On Start-Ups?

Lookouts for La Familia had been noting our passage, calling in our license-plate number, for the past twenty miles, according to my companions, a regional official named Veronica Medina, as I will call her, and Isaac Reyes, a journalist for an online agency.

NEWYORKER: Silver or Lead

There are also political parallels to the debate over same-sex marriage, the passage of which in 2011 depended on a small number of Senate Republican votes joining with a much larger number of Democrats.

WSJ: Medical-Pot Debate Rises in Albany