名词
1. The sound was so loud it was on the threshold of pain.
声音大得开始使人无法忍受。
2. The tax threshold for a pensioner is $6,000.
领退休金的人的纳税起点是六千美元。
3. He had never crossed the threshold of a bar before.
他过去从未进过酒吧的门。
4. Scientists are on the threshold of a breakthrough in their treatment of that disease.
科学家在治疗那种疾病方面很快就要取得突破。