At the same time, the crowding phenomenon in ports is also becoming increasingly serious, which leads to unnecessary nonproductive stay in port.

于此同时，我国很多港口的拥挤现象也越来越严重，导致船舶在港的非生产性停留时间很长。

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But this phenomenon is difficult to prove since the extent of crowding out will vary with the economic cycle.

但这种情况不可一概而论，因为“挤出”的程度因经济周期而不同。

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Industrial cluster is not the phenomenon of many companies crowding together, it has an extremely complex and integrity systematic relationship.

产业集群并不是众多企业的扎堆现象，其内部具有极为复杂和完整的系统关系。

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Unlike Dutch Disease, Crowding Out is basically a domestic phenomenon: it can occur in a country regardless of its international context.

FORBES: Is Russia Suffering From Dutch Disease?

But this phenomenon is difficult to prove since the extent of crowding out will vary with the economic cycle.

ECONOMIST: s struggle to answer a vital question