Precautionary describes an action that is done to stop something dangerous or unpleasant before it happens. Precautionary measures are the extra steps: checks, masks, a cancelled trip, a closed road.

Precautionary「precautionary（預防性的）」 describes形容 an action that is done一個會採取的行動 to stop something dangerous or unpleasant before it happens是為了在危險或不好的事發生之前先阻止它。Precautionary measures預防措施 are the extra steps就是額外採取的步驟: checks檢查, masks戴口罩, a cancelled trip取消行程, a closed road封路。

The word is at home in news, hospitals, weather warnings, and official statements. It often sounds calm and a little distant — “this is only precautionary” means “we do not know that harm is coming, but we will not wait to find out.” Though actually, that sentence can hide a real worry; speakers use the soft word so people do not panic.

The word這個詞 is at home in很常出現在 news, hospitals, weather warnings, and official statements新聞、醫院、氣象警報，還有官方聲明裡。It它 often sounds calm and a little distant聽起來常常很冷靜、有點疏離 — "this is only precautionary"「這只是預防性的」 means意思是 "we do not know that harm is coming, but we will not wait to find out."「我們不確定傷害會不會發生，但不會等到發生才行動」。Though actually不過其實, that sentence那句話 can hide a real worry可能藏著真正的擔憂; speakers說話的人 use the soft word用這個柔和的詞 so是為了 people do not panic不讓大家恐慌。

In environmental talk you will also meet the precautionary principle: if an action might cause serious harm, and the science is still not clear, you hold back rather than push on. That is a specialist use, but it is the same idea grown large.

In environmental talk在環境議題的討論裡 you你 will also meet也會遇到 the precautionary principle「precautionary principle（預警原則）」: if an action might cause serious harm如果一個行動可能造成嚴重傷害, and而且 the science is still not clear科學上還不清楚, you你 hold back rather than push on就先按兵不動，不要硬做下去。That那 is a specialist use是專業上的用法, but不過 it它 is the same idea grown large是同一個概念放大了而已。

The word is almost always an adjective; the everyday noun you want is still precaution.

The word這個詞 is almost always an adjective幾乎都是當形容詞用; the everyday noun you want你要找的日常名詞 is still仍然是 precaution「precaution」。