The first is that the plan described by Sir John and his colleagues works only for a small range of wavelengths.
第一个难题就是约翰爵士及其同事们描述的方案,只适用于较小范围的波长。
Adjust speed in a small range.
需要小范围调速。
At present it has been practiced in a small range.
目前该系统已进行了小范围的试运行。
Maybe it's a tradition, maybe it's to keep the value kind of in a familiar range or a small-- they don't want them to get too expensive because people can't-- small investors can't afford them anymore.
也许是传统使然,也许是为了将价值维持在一个惯常的小区间内,他们不想让价格升得太高,因为人们,小投资者无法承担过高价格
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