interloper

音标发音

The interloper, though, has never been found—until now.
不过，这另一半闯入者直到现在才发现。
He’s a man with many secrets, which he won’t even reveal to a friendly Italian priest (Paolo Bonacelli) who takes an interest in the foreign interloper.
他是个身藏诸多秘密的男人，他甚至不愿意把这些秘密对一个对外国闯入者很有兴趣的意大利牧师（保罗·波那切利）诉说。
However, the scientists’ description of the interloper—“N. miliaris tends to aggregate at the surface to form large, slimy green patches”— is certainly consistent with the bloom shown in this image.
然而，科学家们对这种夜光藻犯境的描述——“它们容易在水面聚集，形成大片粘滑的绿色斑块”——与这幅图像中显示的水华现象吻合。

This second pathway results in the production of further lymphocytes which attack the interloper.
ECONOMIST: Transplant surgery
Unaffected by the African-queen-bee's scent, which normally maintains her majesty's monopoly on reproduction, the interloper activated her ovaries.
ECONOMIST: African honeybees
The interloper evidently must bargain for services that used to be her perquisite.
NEWYORKER: The Seething Hell

someone who becomes involved in an activity or a social group without being asked, or enters a place without permission

If you describe someone as an interloper, you mean that they have come into a situation or a place where they are not wanted or do not belong.