A sandwich made with bacon, lettuce, and tomato

• The initialism for that sandwich

用培根、生菜和番茄制作的三明治

• 指代该三明治的首字母缩写

In astrodynamics, a low-energy trajectory to the Moon

• Initialism of ballistic lunar transfer

航天动力学中通往月球的低能量转移轨道

• 弹道月球转移的缩写