界桩的英文：
boundary post
landmark
terminus boundary marker

boundary是什么意思：
n. 边界；范围；分界线

Boundary is used with administrative areas smaller than a state or country boundary
用于指行政区域,范围比国家小

An exact artificial boundary condition is obtained on a spherical boundary by a constructive method.
同样，采用构造法在球面上获得了精确的无反射人工边界条件。

There are no indecisive boundaries between the two opinions.
这两种意见界线分明。

post是什么意思：
n. 邮政；邮件；柱，桩，杆；岗位
v. 邮寄；张贴；宣告，发表；布置

There was a big post/a lot of post this morning.
今早邮件很多。

Sign posts direct travellers.
路标给游人指路。

You would have posted scam！
你会把诈骗的事给捅出去！

landmark是什么意思：
n. 里程碑；界标，地标

ILT (Interferometric Landmark Tracker)
干扰测量界标跟踪器

Nelson's Column in Trafalgar Square is a London landmark.
特拉法尔加广场上的纳尔逊将军纪念柱是伦敦的标志性建筑。

Describe your location by landmark or area of town.
请按城镇的界标或区域介绍您所在的位置。