It is very important for you to learn some first aid knowledge (skills).
knowledge和skills可以互换，因急救在英语中属于偏动手的一个词汇，用skill（技能）更合适
求一篇关于急救小常识的重要性得初二英语小作文
"Green card" nickname (because of the color) of the United States Permanent Resident Card, an identification document issued by the United States of America affording non-citizens of that country some of the rights its citizens enjoy, sometimes with the prospect of naturalization.
A United States Permanent Resident Card, also known as a green card, is an identification card attesting to the permanent resident status of an alien in the United States of America. Green card also refers to an immigration process of becoming a permanent resident. The green card serves as proof that its holder, a Lawful Permanent Resident (LPR), has been officially granted immigration benefits, which include permission to reside and take employment in the USA. The holder must maintain permanent resident status, and can be removed from the US if certain conditions of this status are not met.
Green cards were formerly issued by the Immigration and Naturalization Service (INS). That agency has been absorbed into and replaced by the Bureau of Citizenship and Immigration Services (BCIS), part of the Department of Homeland Security (DHS). Shortly after re-organization BCIS was renamed to U.S. Citizenship and Immigration Services
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