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可持续性不是一种选择;而是我们对海洋及其依赖者的责任。
The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.
光波,无论是以太波还是其他波,在所有情况下都是时间上的周期性过程。