They are known to occasionally jump out of the water but are not aggressive and use the venomous barb at the end of their tail as a defense mechanism.
他们偶尔会跳出水面，但没有攻击性，他们还利用尾部的毒刺作为防卫武器。
Osteosarcoma is a malignant tumor with aggressive metastasis. The mechanism of metastasis, however, is not completely defined.
成骨肉瘤是一种转移能力很强的恶性肿瘤，目前关于其转移的机制还不完全清楚。
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