1. each other : 彼此, 互相;
2. each and every : 每个;
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1. 每;各;每一
If you refer to each thing or each person in a group, you are referring to every member of the group and considering them as individuals.
2. 每个;每一
If you refer to each one of the members of a group, you are emphasizing that something applies to every one of them.
3. 每一个;各个
You can refer to each and every member of a group to emphasize that you mean all the members of that group.
4. 彼此;互相
You use each other when you are saying that each member of a group does something to the others or has a particular connection with the others.
1. to or from every one of two or more (considered individually)
e.g. they received $10 each