1993年以来，美国就一直寻求与日本在TMD方面进行合作，但日本内部对是否加入一直有不同意见，主要是担心花费巨大及是否有效。去年下半年开始，日本国内借口朝鲜半岛局势，支持参与TMD的呼声日高，政府也表示发展有关的计划势在必行。今年以来，美日合作研究TMD的计划更是紧锣 Since 1993, the United States has always sought to cooperate with Japan in the TMD. However, Japan has always had different opinions on whether or not it joins the WTO, mainly because of its huge cost and effectiveness. Beginning in the second half of last year, Japan excused the situation in the Korean Peninsula and voiced support for its participation in the TMD. The government also said it is imperative to develop the relevant plan. This year, the plan for the United States and Japan to study TMD is even more intense