难于察觉的 meaning in English
difficult to perceive subtle
Examples
- Even if the round test bar indicates acceptable chemical and physical properties , the casting itself may have undetectable inherent deficiencies that reduce strength or corrosion resistance
即使圆形测试杆表明化学特性和物理特性是可接受的，逐渐本身仍然可能存在难于察觉的有损强度或防腐能力的内部缺陷。