The Nature Conservancy has declared war on a multitude of invasive species here, from sheep to plants to the aggressive Argentine ant.

大自然保护协会还向众多入侵物种发起了宣战，从羊群到植物，再到具有攻击性的阿根廷蚁。

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The findings suggest that current chemotherapy approaches which create a harsh microenvironment in the tumor may leave behind the most aggressive and invasive tumor cells.

研究结果暗示，给肿瘤创造一个苛刻微环境的当前的化疗方法也许会遗留最具侵略性和蔓延性的肿瘤细胞。

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These discoveries may help to explain why certain breast cancers are more aggressive than others, or even to identify highly invasive tumors at an early stage.

这些发现可能有助于解释为什么某些乳腺癌细胞比其他细胞具有更强的侵袭性，或甚至在早期鉴别具有侵袭性的肿瘤。

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Doctor Giuliano says rates of survival five years later showed that the less invasive operation was just as successful as the more aggressive action.

VOA: special.2011.03.23

There is also more competition for this food from an aggressive invasive species, the mackerel, which has been drawn north to southern Iceland by the warmer water temperatures.

BBC: Nature��s biggest treasure hunt

Her frisker was very polite and the procedure was barely invasive, if a bit more aggressive than in the past.

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