-----------------------------------
鉄板， てっぱん， テッパン
1. iron plate, steel plate
2. sure thing, certain winner
3. no-fail joke, joke that gets people every time
铁板，钢板；稳操胜券，必胜无疑
-----------------------------------
鉄壁， てっぺき
1. iron wall, impregnable fortress
2. impregnable, invulnerable, unassailable, cast-iron
铜墙铁壁，坚不可摧的堡垒；坚不可摧的，刀枪不入的，无懈可击的，坚如磐石的