Therefore, the study on port-city relation is extremely essential.
因此，研究港城关系是十分必要的。
It is extremely essential and feasible to probe into crop residues industry from the philosophy Angle.
从哲学的角度关注秸秆产业是十分必要的，也是可行的。
Therefore, it is extremely essential for some systems to be designed to protect their benefit in the law.
因此，在法律上设计一些制度来保护未成年人的利益十分必要。
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