上升暖气流要求地表有温差，并有一些地方相对于周围的环境来说被加热了，这些地方会成为上升暖气流的触发点（trigger spot）。触发点有多种形式，例如正对着正午太阳的山脊，被草地环绕的沥青停车场，山脊线上露出地面的岩石，等等。
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Ministers are also looking at ways to make it easier for relatives of residents to trigger spot checks anonymously.
BBC: NEWS | Health | Spot-check boost for care homes
It seems that the analysis at the time - that it would trigger a spate of mergers and takeovers in the banking sector - is being proved spot on.
BBC: Banks braced for more mergers
In addition, Mr. Abdulmutallab's cash purchase of a round-trip ticket didn't trigger any secondary screening, calling into question the efficacy of the system that is supposed to spot passengers who are acting suspiciously and may be threats.
WSJ: The Middle Seat | How to Improve Travel in 2010
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