undesirable elements

基本解释

They are the undesirable elements among the employees.
他们是雇员中的不良分子。
But a small portion of undesirable elements also make use of rented dens .
但是一小部分不良分子也利用租用的窝点。
To keep undesirable elements at bay, the Vanity Fair editor supervises the seating charts himself, while imperturbable, Kissinger-accented manager Varda trains a wary eye on the nightly throngs.
同时冷静沉着、带有基辛格口音的酒店经理埃米尔·瓦尔达也训练了一双机警的眼力，夜夜监视着酒店的人群。

Senior Police Superintendent Vishnu Naidoo says security preparations for next year's World Cup are even more extensive and include steps to prevent undesirable foreign elements from disrupting the event.
Only later would a Yahweh only party polemicize against and seek to suppress certain what came to be seen as undesirable elements of Israelite-Judean religion, and these elements would be labeled Canaanite, as a part of a process of Israelite differentiation.
只有在之后耶和华,唯一的一方争论并且试图压制,那些以色列和犹太宗教中不受欢迎的元素，以及有迦南标记的元素，这是以色列保留差异的一部分过程。
耶鲁公开课 - 旧约导论课程节选

Additionally, they addressed the challenges of metallic CNTs with the invention of a technique to remove these undesirable elements from their circuits.
ENGADGET: Stanford engineers find work around for barriers to carbon nanotube computers
That changed in the mid-1980s, when microscopic sieves--spread throughout steel tubes 30 feet long and 4 to 5 inches in diameter--were developed to filter out undesirable elements before the whey is dried to a powder for use in food manufacturing.
FORBES: Making Whey