Symbols used in Collins Chinese Dictionary Plus (3rd edition), 2011

[georjungcocaine]

The online dictionary Wordreference uses for its Chinese-English version entries from the "Collins Chinese Dictionary Plus (3rd edition), 2011". However, there's no explanation for the symbols, abbreviations, labels etc.  For example, in the entry for 挨, http://www.wordreference.com/zhen/挨, there're black and white arrows, the sentence "see also a1i".

 

Therefore I'd very much appreciate it if somebody could send me such info., which appears on the physical dictionary itself.

[Publius]

Seems obvious. Black arrow indicates compound words containing the character.  White arrow marks example sentences.

'See also a1i' must be OCR error. Should read 'see also ái'.

[陳德聰]

I think a1i is supposed to be āi as above there is a sentence that says a2i, which I can only assume to mean ái.

[vellocet]

I'm sure it's obvious to seasoned Chinese learners, but it's not obvious to everyone else.  That's the problem with these dictionaries, they don't bother to list "obvious" information because they assume everyone else is just as accomplished as they are.  I notice that this dictionary doesn't even list the part of speech, a common problem with most Chinese-English dictionaries.