One proposed option would be passing in some source code and being returned an expression tree instead of just a compiled assembly.

另一种可能是传入一段源代码并返回一颗表达式树，而不是一个编译好的程序集。

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These are used to indicate a target element in the out going message assembly, where an acquired value should overwrite the existing value (in the case where the element already exists in the tree).

这些表达式用于指示输出消息组件中的目标元素，其中获取的元素应该重写现有值(假如树中已经存在元素)。

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In early March, in Perak in Malaysia, the state assembly convened an emergency session under a tree.

三月上旬，在马拉西亚的perak，国会在一棵树下召开了一次紧急会议。

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