Chinese English

一种精密的天文子午仪，在该仪器中，通过物透镜的光被水平轴上的棱镜直角反射进来。该空心轴延伸到支架之外，在其一端装有目镜。

On land, a structure or partition built to retain or prevent sliding of the land. A secondary purpose is to protect the upland against damage from wave action. Bulkheads are frequently backfilled thereby increasing the utility of the adjacent land area.

在陆地上用来堵挡或防止陆地滑坡的建筑结构或隔墙，另外还可以用这种隔墙防止高地被波浪损坏。隔墙经常可以得到回填，因此增加了邻近的土地使用面积。

A floating object moored to the BOTTOM in a particular (charted) place, as an AID TO NAVIGATION or for other specific purposes. Navigational buoys may be classified according to: (a) their shape, appearance, or construction, such as barrel, CAN, cask, CONICAL, cylindrical, DAN, KEG, NUN, PILLAR, SPAR, spherical, or TOPMARK BUOY; (b) their colour, such as black, chequered, green, red buoy; (c) their location, such as BIFURCATION, FAIRWAY, JUNCTION, MID-CHANNEL, MIDDLE-GROUND, or TURNING BUOY; (d) the various kinds of hazards or dangers to NAVIGA­TI­ON which they mark, such as BAR, ISOLATED DANGER, FISH TRAP, OBSTRUCTION, SPOIL GROUND, TELEGRAPH or WRECK BUOY; (e) their particular purpose or use, such as ANCHOR, ANCHORAGE, COMPASS ADJUSTMENT, DREDGING, FAREWELL (or landfall), MARKER, QUARANTINE, STATION (or watch), or WARPING BUOY.

系泊于海底特定位置用于助航或其它目的的浮动标志。导航浮标可按下述方法分类： （a）根据形状、外观或结构分类，如：桶形、罐形、圆锥形、圆柱形、柱形、梁形、球形或带顶浮标； （b）根据颜色分类，如：黑色、黑白方格、绿色、红色浮标； （c）根据所处位置分类，如：分岔、航道、交汇点、航道中线、中沙（洲）或航道转向处浮标。 （d）根据所标示的航行危险物分类，例如：障碍物、孤立危险物、渔栅、梗阻、抛泥区、电讯或沉船浮标； （e）根据特定用途分类，如：锚位、锚地、罗经校正、疏浚、着陆、标记、检疫、观察站或绞滩浮筒等。

A distinctive lateral BUOY used to indicate both the point at which a channel divides and the channel that has been designated as preferred channel.

A BUOY used to indicate that the best navigable water is to be found in one particular of the quadrants that are bounded by the four bearings NW, NE, SE and SW taken from the position of the mark.