chem(chemical cell)

Yes.

One of the functions of salt bridge is "to allow ions to flow through itin order to balance the charge difference caused by the reactions on the twoelectrodes.". Theoretically, ionscan flow through the salt bridge from one half cell to another.

However, due to the high concentration of the solution in the salt bridge, theflow of ions is mainly from the salt bridge to the two half cells, and only asmall portion of the flow of ions is from one half cell to another.

2014-03-27 16:13:28 補充：
可以。

鹽橋的功能之一，是「讓離子流過，以平衡因兩極反應所導致的電荷差異。」理論上，離子可由一個半電池經鹽橋流向另一個半電池。

可是，由於鹽橋中溶液很高，離子的活動主要由鹽橋流向兩個半電池，只有小部分離子由一個半電池流向另一個半電池。

NO
Because the main function of the salt bridge is to provide ions to balance the charge on both cells but also prevent ions in two cells mixed, otherwise, there will be
redox reaction between two cells and leading to malfunctioning of the cell.


Here is one of an example:
(One type of salt bridge consists of a U-shaped glass tube filled with a relatively inert electrolyte; usually potassium chloride or sodium chloride is used.The other type of salt bridge consists of a filter paper, also soaked with a relatively inert electrolyte, usually potassium chloride or sodium chloride because they are chemically inert.) From wiki


Therefore, it can be concluded that ions in two cell can never pass through the salt bridge.
The concentration of the solution in salt bridge only affects the conductivity of the salt bridge(ability and speed to contribute its ions such as K+ and NO3-)