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重点讲解：
1. at the center of 中心；核心；
Being at the center of scientific and popular attention will not be easy for them.
成为科学和公众注意的中心对他们来说不会是一件易事。
2. at the moment 此刻；目前；眼下；
At the moment, no one is talking to me.
此刻没人跟我说话。
3. take control of 控制；掌管；取得对……的控制；
He failed in his attempt to take control of the company.
他试图掌控公司，但以失败告终。
4. keep on hold 延迟；暂缓；搁置；
Seoul should keep rates on hold.
首尔方面应维持当前利率。
n. 光谱，范围，系列
