前面

Floaters look as though they are in front of your eye, but they are in fact shadows from tissue particles in the back of the eye.

飞蚊症看起来虽然他们是在前面的您的眼睛，但他们在事实上的阴影，从组织粒子在后面的眼睛。

Acting as a futures commission merchant, introducing broker, commodities trading advisor, community pool operator, floor broker, leverage transaction merchant, any other person or activity regulated by the Commodity Futures Trading Commission, or an associated person of any of the foregoing, or as an investment advisor, underwriter, broker or dealer in securities, or as an affiliated person, director or employee of any investment company, bank, savings and loan association or insurance company, or engaging in or continuing any conduct or practice in connection with such activity

社区水池操作员作为未来代售商，介绍经纪、商品换顾问，社区水池操作员、地板经纪、杠杆作用交易客商、其他人或活动在商品未来以前调控换委员会，或任何的一个伴生的人前面，或作为一位投资顾问、保险商、经纪或经销商在证券，或作为任何投资公司、银行、存款和贷款协会或保险公司的一名附属的人、主任或雇员，或参与或继续任何品行或实践于这样的活动相联

Wood flooring is expensive up front, but it is beautiful and lasts longer than other types of flooring.

木质地板是昂贵的前面，但它是美丽的，持续时间比其他类型的地板。

The flowerbed is in front of the classroom.

花坛在教室前面。

I went over to one of the stalls and examined porcelain vases and flowered tea-sets.

我走到一个货摊的前面，仔细察看着陶瓷花瓶和饰有花纹的茶具。

Apparently prior sentences (no original set of sentences is provided) are divided into component parts and these are opened up into a field layout (not flush left, spread over the whole page).

显然，前面的句子被分解为构成元素，这些构成元素铺散开来形成原野版面（没有左对齐，只是散布在整个页面上）。

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

If you play with the examples in the previous tutorial long enough, you 'll find out that you cannot change input focus from one child window control to another with Tab key.

如果你与前面课程中的例子一起玩耍了足够长的时间，你将发现你不能用TAB键在两个子控件窗口中来回切换输入焦点。

The smoke fogged up the road ahead .

烟雾笼罩着前面的道路。

Please follow me, I will lead you in front of you.

请跟著我，我会在前面带著你。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了