深入

shēn rù to penetrate deeply; thorough

探究

tàn jiū to investigate; to delve; to probe; to enquire into; to look into

苹果

píng guǒ apple; CL:個|个[ge4],顆|颗[ke1]

APP 签名

qiān míng to sign (one's name with a pen etc); to autograph; signature

TG:@apkyt9wvv