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There are complex structure and fold developed in Longyong coal-field.
龙永煤田构造复杂，褶曲发育。
youdao
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The emergence of a local fold song is influenced from many complex factors.
一个地方民歌的产生是有多方面复杂因素的影响而产生的。
youdao
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The emergence of a local fold song is influenced from many complex factors.
一个地方民歌的产生是有多方面复杂因素的影响而产生的。
youdao