perceptible: applies to what can be discerned, often to a minimum extent, by the senses: a ~ difference in sound.      discern观察到微小事物


sensible: applies to what is clearly apprehended through the senses or impresses itself strongly on the mind: a ~ change in weather.      (apprehend有2个意思: 1、逮捕抓获police have not apprehended her killer警察还未抓获谋杀她的凶手  2、完全理解only now can I begin to apprehend the power of these forces直到现在我才理解它们的力量)


palpable: applies either to what has physical substance or to what is obvious and unmistakable: the tension in the air was almost ~.   来自动词palpate表示触诊触摸     (obvious明显implies conspicuousness in the thing and no need for perspicacity in the observer事情清楚不需敏锐观察his motive is obvious to all but the most obtuse他动机明显)


tangible: suggests what is capable of being handled or grasped either physically or mentally: submitted the gun as ~ evidence.


appreciable: applies to what is distinctly discernible by the senses or definitely measurable: an ~ increase in temperature.     (distinct==clearly different区别明显，definite=clear, unmistakable明显)


ponderable: suggests having definitely measurable weight or importance especially as distinguished from what is so intangible as to elude such determination: exerted a ~ influence on world events.       (注意不要用成ponderous笨重)


perceptible可察觉: 能被感官观察到的，往往是最小程度，sensible感觉明显: 给人明显强烈的感觉，palpable也是感觉明显: 表示物理存在或明显无误，tangible有形: 能触摸把握的，appreciable(大到)可观明显: 能清楚的观察衡量，ponderable重要的: 有重量或重要性


记忆方法: 1) 首字母PP SPAT二人在吵架<==明显    spat: 小口角，为小事争论

               2) 明显的意思是容易被觉察mean apprehensible as real or existent.首字母PP SPAT二人在吵架<==明显