First, the first erasers were made from rubber. Today they are made from many 72.materials. Second, erasers are called "rubbers" in British English.Joseph Priestley from Britain 73.the eraser in 1770, using pieces of rubber from Brazil. On April 15 that year, Joseph Priestley discovered a ...
1 Most people will think about erasers only when they need to change something on their paper. In fact, erasers have a long history.The history of the eraser began in the 1700s. There were lots of rubber trees (橡胶树) in South America. People got rubber from the trees and made many...
Most people will think about erasers only when they need to change something on their paper. In fact, erasers have a long history. The history of the eraser began in the 1700s. There were lots of rubber trees (橡胶树) in South America. People got rubber from the trees and made many ...
agenes acting upon the cell wall, including pectinesterases and pectate lyases were mosthy upregulated 行动在细胞壁的基因,包括果胶酯酶和果胶酶裂合酶mosthy upregulated[translate] a留下了深刻印象 Has made the deep impression[translate] a买到了一张票,我很激动。 Has bought a ticket, I am very ...
12. There___ (be) a pen and two erasers in the pencil- box. 13.You must ___ (get) here at two this afternoon. 14.The twins ___ thirteen two years ago. (be) 15. Where ___ her friend ___ (swim) now, do you know? 16.We can ___ (help ) the teac...
These restaurants were more similar to restaurants we know today. There was a bigger variety of food, and eating in these__restaurants was a more enjoyable experience. In the 19th century, trains made travel much faster and simpler. In the end, this kind of restaurant began to...
Pencils Pencils have been used to make marks on paper since Roman times, when lead rods were used by people to write with. However, a great discovery of pure graphite was made in farmers'fields at Borrowdale in 1564. The journey to the modern pencil began. The villagers went graphite-crazy...
aThis made Rosa happier, but she was still afraid her classmates were making fun of her behind her back. One day , all this changed when Mr Ransom, the coach from the youth club , asked Rosa to play center on their basketball team. He said that Rosa was a good ball player and her...
Magic Erasers are made up of a melamine foam, which has undergone heat compression to increase their durability, explains Brashear, who says that this is the extent of their manipulation. Is Flash the same as Mr. Clean? The bald, earring-sporting strong man we know as Mr. Clean goes by...
aHow many erasers are there in your pencil-case 多少个橡皮擦那里在您的铅笔情形[translate] asometimes you are about to burst into tears 有时您将突然哭起来[translate] a你将会玩得很开心 You will be able to play very much happy[translate] ...