我在后院发现了一只黑寡妇，它背上有明显的红色沙漏形标记。

I found a ___black-widow in the backyard with a distinct red hourglass marking on its back.

警方调查发现，这位连续三任丈夫都意外死亡的女子很可能是个黑寡妇。

Police investigation revealed the woman whose three husbands died unexpectedly might be a ___black widow.