Second-year to Third-year第二学年;第三学年

two- to three-year undergraduate专科生

four- to five-year undergraduate本科生

3-to 5-year-old preschoolers岁儿童

to -year-old岁

year-to-year一年年

year-to-year proportionate change每一年按比例变动

dropped to a seven-year low降至七年以来的最低点

year-to-year tempera M年际温差

year-to-year storage多年调节库容