once upon a time
[phrase]
at a time in the past, often used to introduce a fairy tale or fictional story
wheelchair
[noun]
a chair with wheels that is designed particularly for the use of disabled persons
state of the art
[phrase]
the latest or most advanced level of technology, design, or knowledge in a particular field
to estimate
[verb]
to guess the value, number, quantity, size, etc. of something without exact calculation
workforce
[noun]
all the individuals who work in a particular company, industry, country, etc.
facial expression
[noun]
a way of communicating emotions or attitudes through movements and positions of the face, such as smiling, frowning, or raising eyebrows
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