中国常用成语300个:221 - 230

事半功倍more with less;half the work;twice the effect

事倍功半twice the effort for half the result

十拿九稳very likely to happen;success within reach;extremely certain

十全十美to be completely perfect;flawless;to be perfect

实事求是to seek truth from facts;to be practical and realistic

世外桃源haven of peace;utopia

十之八九most likely (lit. in eight or nine cases out of ten)

手足情深brotherhood

熟能生巧skill comes from practice;with familiarity you learn the trick

数一数二one of the best;outstanding