高层: high level, high class...
潜水: to dive, to go under water, (in an online forum) to lurk...
为期: (to be done) by (a certain date), lasting (a certain time)...
顺畅: smooth and unhindered, fluent...
巧克力: chocolate (loanword)...
古人: people of ancient times, the ancients, extinct human species such as Homo erectus or Homo neanderthalensis, (literary) deceased person...
巩固: to consolidate, consolidation, to strengthen...
勘探: to explore, to survey, to prospect (for oil etc), prospecting...
潜力: potential, capacity...
指南: to guide, guidebook...
