Nirenberg knew Chern personally; the two even collaborated on a joint paper in 1969.
尼伦伯格与陈省身私交不错，两人在1969年还合作发表了一篇论文。
2
When Wang Er-Chern began trading agricultural produce in northern Thailand in the early 1990s, it took two weeks to send goods by road and ship via Laos to his native Yunnan.
上世纪九十年代早期，当Wang er - Chern开始在泰国北部交易农业产品时，他花了两周的时间才把货用船和货车途经老挝运到了云南本地。
3
Seeing our confusing, Mr. Chern paused and explained that he had suffered the intravenous thrombosis, and even was in hospital for the past two months.