“标准的”用英语怎么说

标准的8毫米的胶片每秒放映16组镜头。Standard 8mm projects at 16 frames per second.这家公司听凭环境标准的不断下降。The company had let environmental standards slide.学生脑子里被灌输了各种标准的范例。Standard examples were drummed into students' heads....