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- Bacterial activity in anaerobic wastewater produces hydrogen sulfide gas, particularly in warm climates when sewers are laid on flat grades. 污水中细菌的厌氧活动产生硫化氢气体，尤其在温暖的气候和管道平坦的地方。
- The man jacked up his car to fix a flat tire. 那人用千斤顶把他的汽车顶起以修理漏气的轮胎。
- Pupils who pass the test will be promoted to the next higher grade. 小学生只要考试及格就会升到高年级。
- He stumbled over a stump and fell flat on his face. 他给树桩一绊，摔了个嘴啃泥。
- He spread the map flat out on the floor. 他把地图平铺在地上。
- He's not in the first grade as a musician. 他不是第一流的音乐家。
- Our present lease on the flat expires next month. 我们这套公寓的租约下月到期。
- Business is now on the up grade. 目前生意蒸蒸日上。
- The flat will be refurbished for the new tenants. 这套房间将重新粉刷以接纳新房客。
- Pupils with 90% or more are awarded Grade A. 满90分的学生评为甲等。
- She is buying a flat close to her office. 她正在购买一套靠近她办公室的单元房。
- She lay flat on her back in the warm sunshine. 她在温暖的阳光下平躺著。
- The lease on our flat runs out in a few months. 我们公寓的租约还有几个月就到期了。
- The colours used are flat and unvaried. 使用的颜色既单调又无层次。
- Griddles are used for cooking flat cakes. 这个浅锅是用来烤蛋糕的。
- The sixth grade saw an educational film yesterday. 六年级学生昨天看了一部教育片。
- I got a flat tire of the rear wheel of my bicycle. 我自行车的后轮车胎没气了。
- He received a failing grade on the term paper. 他的期末报告不及格。
- He's asking 80 a month rent for that flat. 那套房间月租他要80英镑。
- Red and yellow grade into orange. 红与黄混合成橘黄。
