about equal to sample的用法和样例：
- We guarantee the quality of the goods to be about equal to the sample.
- The PME may be greatly enlarged (Deinopis) or about equal to the PLE (Menneus).
- Goods sold by sample shall be guaranteed by the seller to be fully equal to sample upon arrival at destination.
- The Atavus were originally a peaceful race, technologically about equal to the Human Stone Age.