The standard is modeled after LEED with three conformance levels—Level One, Two, and Three, with Three being the highest—specific prerequisites, and optional credits.
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and optional credits
还有可选学分
以上为机器翻译结果，长、整句建议使用 人工翻译 。
B: Well, you have to get 166 credits, including required courses and optional courses.
B：嗯，你必须得到166学分，包括必修课和选修课。
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