(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
學習
xué xíㄒㄩㄝˊ ㄒㄧˊ
to learn; to study[cedict]
水
shuǐㄕㄨㄟˇ
water; river; surname Shui[cedict]
對
duìㄉㄨㄟˋ
couple; pair; to be opposite; to oppose; to face; for; to; correct (answer); to answer; to reply; to direct (towards sth); right[cedict]
表皮
biǎo píㄅㄧㄠˇ ㄆㄧˊ
epidermis; cuticle[cedict]
的
deㄉㄜ˙
díㄉㄧˊ
dìㄉㄧˋ
of; structural particle: used before a noun, linking it to preceding possessive or descriptive attributive[cedict]
really and truly[cedict]
aim; clear[cedict]
滲透
shèn tòuㄕㄣˋ ㄊㄡˋ
to permeate; to infiltrate[cedict]
作用
zuò yòngㄗㄨㄛˋ ㄩㄥˋ
to act on; to affect; action; function; activity; impact; result; effect; purpose; intent; to play a role; corresponds to English -ity, -ism, -ization[cedict]