subtle a. delicate hardly noticeable
【公共课笔记串讲】串讲自考英语阅读（二）词汇UNIT1-4 ... strengthen v. make sth. strong or stronger 加强 subtle a. delicate， hardly noticeable 微妙的；难以觉察的 vehicle n. a machine that carries people or things from place to place 运输工具；车辆 ...
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短语
难以察觉的
inconspicuous
;
[科技]
unobservable
;
Imperceptible
;
subtle
德〕难以察觉的
unmerklich