这个国家的这一地区仍很落后；没有铁路或公路，也没有电力。
This part of the country is still backward; there are no railways or motor-roads, and no electricity.
这些延迟在谈话进程中源源不断地涌现出来，这个孩子可能就会落后于正常发育的同龄人了。
The delays may cascade as a conversationprogresses, and the child may lag behind typically developing peers.
这些延迟在谈话进程中源源不断地涌现出来，这个孩子可能就会落后于正常发育的同龄人了。
The delays may cascade as a conversationprogresses, and the child may lag behind typically developing peers.
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