大学城的学生可能还有另一种参与进阶数学的手段：数学圈。
Students in university towns may also have access to another lever for involvement in accelerated math: math circles.
对于数学家而言，一把椅子相当于一个苹果；一个杯子——至少是有把手的——就像一个油炸圈饼。
To mathematicians, a chair is equivalent to an apple; a mug—at least, one with a handle—is like a doughnut.
对于数学家而言，一把椅子就相当于一个苹果，一个带柄的杯子就像一个油炸圈饼。
To mathematicians, a chair is equivalent to an apple; a mug-at least, one with a handle-is like a doughnut.
听并圈出。陈小姐是一个数学/英语老师。格雷先生是一个音乐/语文老师。 再听一次并回答。 陈小姐是什么样的？ 格雷先生是什么样的？
Miss Chen is a maths / an English teacher. Mr Grey is a music / Chinese teacher. Listen again and answer. What is Miss Chen like? What is Mr Grey like?
介绍了光电测微系统的基本原理及其构成，分析了该系统的关键环节即聚焦伺服系统，建立了音圈电机的数学模型。
The focus servo system of the OM is analyzed and the mathematical model of the voice-coil motor is presented.
以音圈电机工作原理分析为基础，给出其动态数学模型。
The mathematical model of voice coil motor was presented by analyzing the principle of motor, and the fuzzy reasoning method was used to regulate PID parameters.
本文叙述了交流电机定子圈式线圈计算及设计中的问题，并给出了定子圈式线圈设计计算的数学模型和图形绘制方法。
C. electric machine are described in this paper. The mathematical model and plotting method for designing stator diamond coil are given also.
分析了音圈电机的工作原理，建立了音圈电机的数学模型，并对其传递函数进行数字化。
The principle of voice coil motor is analyzed, and the mathematical model is built. The motor's transfer function is digitized.
分析了DVD聚焦伺服系统中音圈电机和光头拾取器的数学模型，通过实验测定其模型参数，完成了DVD聚焦伺服系统的建模，并进行了仿真。
The model of voice coil motor and optical pickup unit are analyzed, the model parameters are tested, the model of DVD focus servo system is built and the simulation is carried out.
介绍了光电测微系统的基本原理及其构成，分析了该系统的关键环节即聚焦伺服系统，建立了音圈电机的数学模型。
This paper deals with the open system of numerical control based on Windows98, mainly discussing the interface module , the manage module and the servo module.
介绍了光电测微系统的基本原理及其构成，分析了该系统的关键环节即聚焦伺服系统，建立了音圈电机的数学模型。
This paper deals with the open system of numerical control based on Windows98, mainly discussing the interface module , the manage module and the servo module.
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