teens         
noun [ plural ] uk/tiːnz/ us/tiːnz/
 十几岁
A person's teens are the period in which they are aged between 13 and 19
  Both my daughters are in their teens. 我的两个女儿都十几岁。 
 He's in his early/mid/late teens. 他十三四/十五六/十八九岁。 
 the teens 13至19摄氏度的温度范围
the range of temperature between 13° and 19°
  The temperature is expected to be in the teens tomorrow. 预期明天的温度介于13至19摄氏度之间。