The other is the first step on the path to a particular sort of tissue such as the lining of a windpipe.
这一细胞在进化中首先会形成一个特殊的像气管内层一样薄膜组织。
See from the distant, there are many horse groups lining in a line step by step.
远远看去，马帮在路上总算拉成一条线，不紧不慢地跟着。
See from the distant, there are many horse groups lining in a line step by step.
远远看去，马帮在路上总算拉成一条线，不紧不慢地跟着。
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