茫的英文：
vague
vast

• To be utterly ignorant of the affair
  茫不知情
• Van de Graaff generators are the current workhorse of nuclear stucture research.
  茫德格喇夫加速器是研究原子結(jié)構(gòu)的通用工具。
• The wide grey eyes, almost vacant yet so moving, held him beyond himself.
  她那雙大眼睛茫然而動人，他不由自主地被吸引住了。

• You should not make vague promises.
  你不該作含糊不清的承諾。
• His thought was too vague to be described.
  他的思路混混沌沌，難以理清。
• Everything looked vague in the heavy fog.
  在濃霧中，一切東西看上去都很模糊。

• A vast crowd impacted the square.
  廣場上擠集了一大群人。
• That that vast barren area is inhabited.
  那片廣闊的荒蕪地區(qū)有一些人類在居住。
• Vast distances boggle the mind.
  距離之大，不可思議。