Because according to your thinking, "one+safety = smoke" means: splash+(one+safety) = deviation, splash+smoke = deviation, but the writing is different, pian≠pyan.

The reason why there is such a doubt is that in the Chinese Pinyin scheme, words with zero initials are represented by "Y" and "W" in order to omit sound insulation symbols and facilitate learning, just as the pinyin of "yan" is not "ian".

A word group:

1, arranged in [ān pái]?

Deal with (things) in an orderly way; Placement (personnel): ~ work. ~ life. ~ He is a statistician.

2. stable?

(life, situation, etc) calm and normal; Stability: life ~. Emotion. Social order.

3. safety [b o ā n]?

Maintaining public order: strengthening work.