But this approach presupposed the distinction between observation sentences and non-observation sentences in a language, and observation sentences are evidence for knowledge of external world.
但是这个进路预设了自然语言中有很明确的观察语句与非观察语句的区分，而且观察语句同时是作为有关外在世界的知识的证据。
It is found that during the period of observation, the child's production of BA is dominantly in imperative sentences and the number of interrogative and declarative sentences is very limited.
研究发现，在此期间，儿童所产生的含“吧”的语句多为祈使句，仅有少数的疑问句和陈述句。
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