相关例句

• There were long periods of silence. (有长时间的沉默。)
• The Stone Age is divided into different periods. (石器时代被分为不同的时期。)
• The school day is divided into six periods. (学校一天分为六个课时。)
• This is a difficult period for her. (这对她来说是一个艰难的阶段。)
• The periods of economic growth were followed by recession. (经济增长期之后是衰退期。)
• These are the most important periods in history. (这些是历史上最重要的时期。)
• The menstrual periods are normal for her. (她的生理期正常。)
• There are three testing periods this semester. (这个学期有三个测试阶段。)
• The incubation periods vary for different diseases. (不同疾病的潜伏期不同。)
• The Cretaceous period is one of the important geological periods. (白垩纪是重要的地质时期之一。)