例句與造句

1. The studies may indicate that an earthfill dam with a center concrete gravity overflow spillway section is the most economical, in a wide flat valley .
   方案表明，在寬闊而平坦的河谷內(nèi)，一種在中間段設(shè)置混凝土重試溢洪道的土壩是最經(jīng)濟(jì)的。
2. It's difficult to find overflow spillway in a sentence. 用overflow spillway造句挺難的