difficult or impossible to comprehend or explain
神秘的, 难以理解的
徒步旅行者在茂密森林中的失踪很神秘，没有留下任何清晰的痕迹或证据。
the act of forcibly taking someone away, typically by kidnapping
绑架, 劫持
她的绑架案被立即报告，引发了全州范围的搜索。
the act or instance of going missing, often without explanation or a trace left behind
消失, 失踪
他的突然消失让他的朋友和家人感到担忧。
the act of finding something for the first time and before others
发现, 发觉
to get out of or avoid an unpleasant situation
逃脱, 避开
a sudden violent release of energy that causes gases or other material to expand rapidly, often with heat, noise, and destruction
爆炸, 爆裂
the act or crime of dishonestly taking something that belongs to someone else
盗窃, 偷窃
a building where people who did something illegal, such as stealing, murder, etc., are kept as a punishment
监狱, 牢房
very large in size
巨大的, 庞大的
他买了一台巨大的电视，占了他客厅的整面墙。
a scheduled journey by an aircraft
航班, 飞行旅程
the vast body of salt water that covers most of Earth's surface
to say that something is the case without providing proof for it
声称, 断言
not kind or nice toward other people
不友好的, 敌对的
司机不友好，拒绝帮忙搬行李。
a creature believed or imagined to come from a planet other than Earth
外星人, 异形
situated or happening below the surface of a body of water
水下的, 水下
他购买了一台水下相机，以便在浮潜旅行中拍摄图像。
someone who jumps into a body of water as a sport
潜水员, 跳水运动员
她作为潜水员训练了多年，以完善她的比赛技术。
a person who steals from someone or something using force or threat of violence
强盗, 抢劫犯
警方逮捕了一直恐吓当地社区的强盗。
something that cannot be understood or explained because important facts are unknown
谜, 奥秘
a room used for a specific purpose, often with a particular function, such as a private space for sleeping or a meeting room for formal discussions
房间, 会议室
a stone monument built in ancient Egypt usually as a tomb for the pharaohs, which has a triangular or square base that slopes up to the top
金字塔, 金字塔纪念碑
玛雅人在中美洲建造了令人印象深刻的金字塔。
a mysterious object that some people claim to have seen flying around in the sky and assume that it is a spaceship from another world
不明飞行物
军方调查了军事基地附近多起不明飞行物的报告。
