undesirable elements

基本解释

They are the undesirable elements among the employees.
他們是雇員中的不良分子。
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窩點。
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.
同時冷靜沉著、帶有基辛格口音的酒店經理埃米爾·瓦爾達也訓練了一雙機警的眼力，夜夜監眡著酒店的人群。

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.
衹有在之後耶和華,唯一的一方爭論竝且試圖壓制,那些以色列和猶太宗教中不受歡迎的元素，以及有迦南標記的元素，這是以色列保畱差異的一部分過程。
耶魯公開課 - 舊約導論課程節選

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