When I discovered I was pregnant ( 怀孕的),my husband and I decided to shut our shop in a town of South Africa, so my husband could accept a job in Pretoria, a city some distance away. As I felt 16 because of my pregnancy, I had to 17 until after birth. While my husband 18 in the city, I still had to work in the hot weather. I 19 a lot from terrible sickness. My warm and helpful 20 helped me during the day, but at night I was 21 in our fla在光学显微镜下不易看到细胞膜._____