The layout design of optical instruments is a subject under development.
光学仪器的总体设计是正在形成的一门课题。
The requisite instruments were built by the optical industry within a short period of time.
必要的工具在短时段内被眼睛的工业建造。
The requisite instruments were built by the optical industry within a short period of time.
必要的工具在短时段内被眼睛的工业建造。
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