简单

simple; plain; brief; uncomplicated; straightforward; easy; elementary; undemanding; simply; plainly; simplicity; easiness; simplify; make simple; keep it simple; make it simple; tout court; easy as pie

上口

be catchy; be easy to pronounce; be easy to say

重复

repeat; duplicate; replicate; replay; reprise; iterate; keep; echo; rehearse; reduplicate; do over; trot out; regurgitate; repeat yourself; repetitive; repeated; repetitious; constant; warmed-over; repeatedly; bis; repetition; rehearsal; redundancy; duplication; over and over again; over and over