tripod-mounted binocular
炮队镜(安装在三角架上的双筒望远镜)

• eigenfrequency
• eigenfunction
• eigenmatrix
• eigenmode
• eigenperiod
• eigenresolution
• eigenstate
• eigenvalue
• eigenvalue equation
• eigenvector
• eikonal coefficient
• eikonal equation
• eikonal function
• eikonogen
• eikonometer
• Einstein-Fowler equation
• Einstein's relation
• Einstein summatin convention
• Einstelin coefficient
• ejkpicyclic geeear
• ekonal
• Ektar lens
• elastance
• elastic
• elastic bush