The limiting magnitude is directly related to aperture, where larger apertures allow you to see fainter stars.
边缘亮度直接与孔径相关，孔径越大，就能看到越暗的星。
You're going to be dealing with long-exposures and wide-open apertures, which means any environmental light will creep into the frame and overpower the image.
因为你必须使用大光圈和长时间曝光，也就是说任何环境中的光线都会进入画面造成过曝。
Proper focusing is critical at night because small apertures are often impractical — therefore one cannot afford to waste mispositioning the depth of field (see hyperfocal distance).
在夜晚，合适的聚焦非常关键，因为小光圈常常不合实际。因此，你不能错误地定位景深 （超焦距）。
Just like a lens has a range of apertures, your camera has a range of shutter speeds.
就像镜头有一个光圈范围，你的相机也有一个快门速度的范围。
Tiao and Hu noticed that all people have seven apertures in their heads but only Hundun has no.
鯈与忽注意到所有人都有口耳目鼻等七窍，而唯独浑沌没有。
The apertures also provide identification markers for the slide clamp.
孔也为滑动夹提供识别标记。
An aperture mask assembly includes a rotatable frame and a mask having apertures.
一种孔眼掩模组件包括可旋转机架和具有孔眼的掩模。
In the production and propagation of lasers there are more or less limiting apertures.
在激光的产生和传输过程中或多或少地要受到光阑的限制。
Using ray-matrix method we investigated the resonators containing two kinds of apertures.
用光线矩阵方法研究了两类带有光阑的谐振腔。
Further, the bonding conditions may be selected so that apertures do not form in the film.
此外，可以选择粘合条件以便在该薄膜中不形成孔。
Pollen grain is mainly 2-celled type when shed, occasionally 3-celled type, and has three apertures.
成熟花粉多为2 -细胞型，偶见3 -细胞型，具三萌发孔。
A laser on-line measuring method for over-size and over-percentage apertures of wire sieves is described.
介绍了金属筛超大网孔尺寸及超差比例的激光在线检测方法。
Above, irregularly shaped apertures puncture the elevation, lending the scheme a playfully abstract quality.
建筑上方，不规则形状的孔洞穿插在立面上，为该方案增加有趣的抽象的品质。
After azimuth compression, the sub-apertures are arrayed and synthesized to offer a full-aperture resolution image.
方位向压缩后，将各子孔径数据按时间先后排序拼接、运算，合成出全孔径分辨率图像。
The exterior walls are clad in over one million reflective glass tiles and are punctured with various-shaped apertures.
外墙覆盖了百万块反光玻璃瓷砖，墙面上有各种造型的开口。
The electromagnetic coupling of an incident plane wave through some small apertures into a shielding cavity is studied.
研究了平面电磁波与带多孔的屏蔽腔体的耦合问题。
The sparse-aperture system of dual three sub-apertures has the advantages of flexible configuration and easy fabrication.
复合三子镜具有结构灵活、易于装调的优点。
The difficulty in the mould design is how to form a number of apertures in four side face by side core-pulling mechanism.
该模具设计的难点是四个侧面都需要通过抽芯成型多个侧孔。
The intrinsic properties of the process result in apertures with a trapezoidal cross-section, which enhance paste release.
工艺的内在特性，导致孔内形成梯形断面，这有助于锡膏释放。
At last the light intensity distribution of Fresnel diffraction at several rectangular apertures is calculated and analyzed.
最后计算分析了多矩孔菲涅尔衍射的光强分布。
Topics covered in geometrical optics include: ray-tracing, aberrations, lens design, apertures and stops, radiometry and photometry.
涵盖的主题包括：几何光学射线追踪，畸变，镜头设计，孔径和停止，辐射计和光度法。
The far-field anomalous spectral behaviors of a Gaussian pulsed beam passing through a linear circular apertures array are studied.
研究了超短高斯脉冲光束经线性排列的矩形光阑阵列衍射后的远场光谱奇变现象。
Objective To observe morphology and locality of the cecums and morphology and size of the ileocecal apertures and the ileocecal valves.
目的观测盲肠的形态和位置，回盲口和回盲瓣的形态、大小。
Therefore, proper distance between the transmit apertures could be selected to get better interference fringes and high resolution images.
在实际干涉成像中，可以选择适当的孔径间距来获得较好的干涉条纹，从而获得目标的高分辨率像。
Antennas of various apertures and bands are already in mass production and have been put into use in microwave relay communication systems.
批量生产的不同口径及频段的这类天线已用于微波通信系统中。
Depending on the density of the apertures in a particular region of the stencil, it may be necessary to print on only a portion of the pad.
在钢网的特定区域，根据孔的密度，有必要只印刷焊盘的一部分。
Their specific treatment of volume, apertures, and overall geometry interested us as tools to estrange conventional ideas of residential housing.
该建筑在体量、孔径和整体几何形状上的处理手法都激发我们有了远离传统住宅的想法。
Vibrating mesh nebulizer use vibration of piezoelectric ceramic transmit to mesh, the vibrating mesh push the liquid drug through the apertures.
另一种是振动网孔雾化器，压电陶瓷的振动传递给网孔板，网孔板随之振动挤出药液形成气雾。
A pressure cooker explosion protection safety bulkhead is evenly provided with more than a thousand apertures and also a handhold in the middle.
一种压力锅防爆安全隔板，在隔板上均匀分布有千个以上小孔，中部有拉手。
A pressure cooker explosion protection safety bulkhead is evenly provided with more than a thousand apertures and also a handhold in the middle.
一种压力锅防爆安全隔板，在隔板上均匀分布有千个以上小孔，中部有拉手。
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