at a time in the past, often used to introduce a fairy tale or fictional story
relating to or characteristic of robots, typically displaying automated or mechanical behavior
机器人的, 自动的
机器人吸尘器绕过障碍物并自主清洁地板。
a chair with wheels that is designed particularly for the use of disabled persons
轮椅, 轮椅车
她买了一辆带有电动马达的新轮椅。
a state of being free from pain, worry, or other unpleasant feelings
舒适, 安慰
very necessary for a particular purpose or situation
必要的, 必不可少的
books, movies, etc. about imaginary things based on science
科幻, SF
他喜欢让他思考未来的科幻故事。
to have actual presence or reality, even if no one is thinking about it or noticing it
存在, 有
the latest or most advanced level of technology, design, or knowledge in a particular field
an old person, especially someone who is retired
老年人, 退休人员
社区中心专门为老年人提供各种活动。
to guess the value, number, quantity, size, etc. of something without exact calculation
估计, 估算
to become smaller or less in amount, number, size, or intensity
减少, 下降
all the people who work for a particular company, industry, organization, or country
a situation in which there is not enough of something that is needed or wanted
a period of time in which someone no longer works due to old age
退休岁月, 晚年退休生活
他认真存钱，好在退休岁月里去旅行。
the failure or collapse of a relationship, system, process, or arrangement
破裂, 崩溃
an order, particularly given by someone in a position of authority
命令, 指令
a way of communicating emotions or attitudes through movements and positions of the face, such as smiling, frowning, or raising eyebrows
面部表情
他试图隐藏他的愤怒，但他的面部表情出卖了他。
