“机会主义者”必须不断入侵新的地区，以弥补被更具竞争力的物种取代的损失。
Opportunists must constantly invade new areas to compensate for being displaced by more competitive species.
然而，骨髓是个例外，因为即使在成年人体内，骨髓细胞也在不断分裂，以取代老化的血细胞。
Bone marrow is an exception to this rule, however, since even in adults, bone marrow cells continually divide to replace old blood cells.
近些年其地位不断被激进派对手哈马斯取代。
In recent years it has been losing ground to its militant rival, Hamas.
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