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clamping error | 夹紧误差
| See ERROR. | 使用复测经纬仪观测中，用仪器的固定装置固定时所产生的系统误差。 |
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clamp (or clamping) screw | （六分仪）夹紧螺钉
，制动螺旋 | A screw for holding in place a moving part of an instrument as during an OBSERVATION or reading with a THEODOLITE or SEXTANT. | 在观测期间或读取经纬仪和六分仪读数时用来固定仪器活动部位的一种螺钉。 |
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clamshell snapper | 蛤壳式（底质）取样器
| See SNAPPER. | 参见snapper（采样器）。 |
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clapotis | 驻波
| The French equivalent for a type of STANDING WAVE. | 法语词，指一种驻波。 |
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Clarke's spheroid | 克拉克椭球体
| See REFERENCE SPHEROID. | 见“参考椭球”。 |
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clay | 粘土
| Mineralogically, a hydrous aluminium silicate material with plastic properties and a crystal structure. As a size term, refers to sediment ... more | 在矿物学中，具有塑性特性和晶体结构的水合硅酸铝。
该术语的量值定义指直径0.0039到0.00024毫米的泥沙颗粒，包含岩粉、石灰泥、霰石等成分。 |
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clean | 安全的；无障碍的
| (adj.). Free from OBSTRUCTIONS, unevenness, imperfections, as a clean ANCHORAGE. | 指水域已排除障碍物、不平坦及不良情况的，如无碍航物锚地。 |
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clear | 使畅通，保持距离
| (v.t.). To make such distance from an object as to have open sea-room. | 与目标保持一定距离，使其间留出宽阔的水域。 |
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clearance | 安全距离；富裕水深；云缝，云消
| In NAVIGATION, a safe distance off a danger. In METEOROLOGY: a) decrease of total CLOUD AMOUNT when the latter is large; b) TIME at which t... more | 航海学中，指避开危险物的安全距离。
在气象学中：a) 当云量大的时候，总云量的减少； b) 云量减小发生的时间；c) 布满天空的云层中出现的缝隙。亦称云消（clearing）。 |
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clearance: bridge | 桥梁净空
| Minimum vertical or horizontal space available for passage. | 桥梁下可通过的最小垂直或水平空间。 |
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clearance: overhead pipeline | 架空管线净空
| Minimum vertical or horizontal space available for passage. | 可供航道的最小垂直或水平空间。 |
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clearance: safe overhead | 安全净空高度 | The HEIGHT above the VERTICAL CONTROL DATUM at which the highest points of a ship can pass under an overhead power CABLE without risk of ele... more | 高程基准面以上的高度，在此高度上船只的最高点能够从架空电缆底下通过而不会受到电击的危险或者碰撞桥梁的危险。 |
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cleared depth | 净深度
| The effective depth over a feature, obtained by a wire drag survey. | 通过扫测所获得的海底地物以上的有效水深。 |
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clearing | 富裕水深
| See CLEARANCE. | 参见clearance（富裕水深）。 |
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clearing line | 安全导航线
| A straight line, on a CHART, that marks the BOUNDARY between a safe and a dangerous area; or that passes clear of a navigational danger. Sec... more | 海图上标示安全区与危险区界线的直线，或者标示避开航行危险物的航道线以及通常表示灯塔扇形光弧范围的直线。 |
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clearing marks | 安全标志，避险标
| Selected MARKS, natural or otherwise, used to help vessels keep clear of dangers. | 帮助船舶避开危险物的自然标志或其它标志。 |
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clear sweeping | 定深扫海
| A form of BAR SWEEPING. A sweep, set at a predetermined depth, and passed over an area to ensure that no obstructions have been missed. | 杆式扫海的一种形式，在预定深度对某一区域进行扫海测量，确保不遗漏任何障碍物。 |
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cliff | 悬崖，峭壁
| LAND rising abruptly for a considerable distance above the water or surrounding LAND. | 从水面或周围陆地快速升高一定高度的陆地。 |
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climate | 气候
| Fluctuating aggregate of atmospheric conditions characterized by the states and developments of the WEATHER of a given area. | 反映某地区天气状况及发展所表示的大气条件变化的集合。 |
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climatology | 气候学
| Study of CLIMATES (causes, variations, distributions, types, etc.). | 研究气候成因、变化、分布、类型等方面的科学。 |