In ancient Chinese, "er" can be used in two ways: sequential and reverse. The meaning of the sentence is "succession", that is, the previous action has a logical or factual relationship with the subsequent action. The reverse connection is when the latter action is opposite or logically opposite to the previous action.
1. Succession is divided into three situations: 1 parallel, 2 continuous, and 3 advanced.
1. Parallel, which means that two things are equally important, similar to a list;
2. Succession, which emphasizes the sequence of the occurrence of the two things and the occurrence of the event. Process;
3. Progression, the emphasis is on the latter. The former is either foreshadowing or contrast, both for the purpose of explaining the latter.
Translation depends on the specific context. Generally, it can be translated as "and, and", "then, then", "more, especially".
2. Reverse connection, indicating a turning point, can be translated as que, jiu. Such as persevering and giving up is a logical turning point, which is translated as "give up after carving".