Native species, on the other hand, keep each other's numbers in check over the long term, so it is very hard for them to compete with opportunistic newcomers.
本土物種則彼此長期維持在平衡狀態，很難與身懷「機會主義者」性格的外來客競爭，外來種因此輕易吞噬著各地生態的獨特性與多元性。