开开｀心心
complex; Marine construction technology like this is very complex, somewhat analogous to trying to build a bridge under water.像这样的海底建造技术很复杂，与尝试在水下建桥有些相似。
ZJ张某某
复杂complex复杂[fù zá]释义complex; complicated; complexity ; sophisticated; intricate网络complication; complicate; complexities
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