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

都公司利用转基因技术获得了第一株抗
毒
转基因烟草植株,拉开了转基因育

幕。
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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
2019 
病毒病,加拿大在 2020 年 3 月关闭了与美国的整个
,禁止非
要的旅行,一年零五个月后,他们终于在 8 月 9 日再次开放了
。
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