It undrew the prelude of transgenic breeding that the company of Monsanto Company obtained the first transgenic tobacco plant which had resistance to tobacco virus by transgenic technique in 1986.
1986年美国孟山都公司利用转基因技术获得了第





转基因烟草植
,拉开了转基因育种
序幕。
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2月合集 In response to COVID-19, Canada shut the entire border down with the United States to non-essential travel back in March 2020 and they're finally opening it back up again on August, 9th after one year and five months.
为了应对 2019 冠


,加拿大在 2020
3 月关闭了与美国的整个边境,禁止非
要的旅行,一
零五个月后,他们终于在 8 月 9 日再次开放了边境。
12月合集
10月合集
合集
3月合集