非关税壁垒用英文怎么解释

我要的是英文解释，不是翻译！

Non-tariff barrier : Government measures other than tariffs to restrict imports.

非关税壁垒（（nontariff barriers））是指关税以外的各种限制进口的措施。非关税壁垒可以分为直接的和间接的两大类：直接的非关税壁垒措施也称直接的数量限制，是由进口国直接对进口商品的数量或金额加以限制，或迫使出口国直接限制商品的出口。这类措施有：进口配额制、许可证制、“自动”出口限制等。间接的非关税壁垒措施是对进口商品制定严格的条例或规定，间接地限制商品进口，如进口押金制、最低进口限价、苛刻复杂的技术标准等。关税壁垒 出口 进口 配额 许可证

non-tariff barriers: Non-tariff barriers to trade (NTBs) are trade barriers that restrict imports but are not in the usual form of a tariff. Some common examples of NTB's are anti-dumping measures and countervailing duties, which, although they are called "non-tariff" barriers, have the effect of tariffs once they are enacted. Their use has risen sharply after the WTO rules led to a very significant reduction in tariff use. Some non-tariff trade barriers are expressly permitted in very limited circumstances, when they are deemed necessary to protect health, safety, or sanitation, or to protect depletable natural resources. In other forms, they are criticized as a means to evade free trade rules such as those of the World Trade Organization (WTO), the European Union (EU), or North American Free Trade Agreement (NAFTA) that restrict the use of tariffs.