Even so fundamental a dimension (量纲) as time was measured extremely crudely with sand and water clocks hundreds of years ago.
举一反三
- That was long ago. A very long time ago. Almost 30 years ago.
- When was the man in New York A: About two years ago. B: About one year ago, C: About three years ago.
- A water power station (build) ________ in the area several years ago.
- We each other since known; ten years ago. A: have known; ten years ago B: knew; ten years ago C: have known; ten years D: knew; ten years
- Feudalism is not a(n) ______ as it was hundreds years ago. A: option B: optical C: selection D: election