The astrolabe had long been the primary instrument for navigation, having been introduced in the eleventh century.
自11世纪星盘被引入以来，它一直都是航海的重要工具。
Gray's early music was in a contemporary folk-rock, singer-songwriter mode; his primary instrument was acoustic guitar, with occasional piano.
Gray早期的音乐类型属于当代摇滚民谣并且是一个唱作人。他早期使用的乐器是原声吉他，偶尔使用钢琴。
The difficulty lies on keeping the amplitude in a proper range to activate the primary instrument, neither too high nor too low.
驱动设计的难点在于必须保持激振信号幅度在合适的范围内，过大过小都不能驱动一次仪表正常工作。
Keratometry - a keratometer is the primary instrument used to measure the curvature of the cornea.
角膜曲率检测——角膜曲率计是用来检测角膜曲率的仪器。
US Army New Training Helicopter(NTH)is a non-developmental item commercial helicopter which is to replace Bell UH-1H as an initial en- try rotary wing and primary instrument trainer.
美国陆军新型教练直升机是一个非新研项目的批量生产直升机，用以取代初级训练及仪表飞行训练用的贝尔UH-1H。
Analog circuit mainly realizes the drive system consisting of physical loop and gain-controlled loop and signal pre-processing system which ACTS on output signals from primary instrument.
模拟电路主要实现了由物理闭环和增益控制闭环构成的驱动系统，以及对一次仪表输出信号进行预处理的信号预处理系统。
Analog circuit mainly realizes the drive system consisting of physical loop and gain-controlled loop and signal pre-processing system which ACTS on output signals from primary instrument.
模拟电路主要实现了由物理闭环和增益控制闭环构成的驱动系统，以及对一次仪表输出信号进行预处理的信号预处理系统。
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