"Only one of Party A and Party B participates" means that one of Party A and Party B must participate, but not both.
Extended data:
Other logically related words:
1. Contrast and juxtaposition: The situations listed in the preceding and following clauses have opposite or far-reaching significance. Use the contrast between affirmation and negation to express the meaning of affirmation, indicating that the situation is contrary to expectations. There are partial sentences between clauses, that is, there are sequential sentences and primary and secondary sentences. The first sentence is the second sentence, and the last sentence is the main sentence.
Related words: "No? But? " , "is it? Not? " .
Example A: Wang Zhaojun is (not) an ordinary figure, (but) a symbol; Zhaojun Tomb is (not) an ordinary tomb, (but) a monument of national friendship.
Exodus B: So, when bees make honey, they are brewing the sweetest life for mankind, just storing food for themselves.
She didn't come to school today, (not) because she wanted to play truant, (but) because she was ill.
Second, the progressive relationship: connected by two or more clauses, indicating that the latter situation is deeper.
There are partial sentences and affirmative sentences between clauses, the former partial sentences and the latter affirmative sentences. The order is fixed and cannot be changed at will.
The main related words are: "Not only? Then what? " , "not only that? Still? " ,"? No, but no? Instead? ","even? Still? " ,"? Besides? ”,"? Even? ”。