聚羟基乙酸的经典制备方法主要有两种:直接缩合聚合法和乙交酯开环聚合法. There are two means available for the preparation of PGA - synthesis polymerization and ring - opening polymerization.
The ads. ballyhooed the movie's virtues.广告大肆宣扬那部影片的优点.The power of red wine to counteract high cholesterol has been ballyhooed in the press.红酒降低胆固醇的功效被媒体夸大了。...the much-ballyhooed new Star Wars movie.受到热炒的新一集《星球大战》电...
她的诗在风格上是时髦的实验派，主题艰深难懂。Her poems are modishly experi-mental in style and recondite in subject-matter.这说明书看起来很难懂。The instructions look very complicated.这些注释有助于弄清文中最难懂的部分.The note help to elucidate the most difficult parts ...