2·WARNING indicates an injury hazard not immediately accessible as you read the marking.
警告，表明了当你看到此标志时，没有马上接近受伤危险。
4·Identifying guide for the outdoors, including road marking, outdoor billboards, hotel restaurant guide license, cell function CARDS, cell warning signs, guides license.
标识用于户外的包括道路引导标识、户外广告牌、酒店饭店引导牌、小区功能牌、小区警示牌、导视牌。