水面

Line L4: Abeam abeam Maji Shan No.2 buoy （30°37′.30 N/122°30′.53E）.5.Line C1: the connection line between Xiaocaihua Light beacon and the west end of Zhoushan Dao（30°10′.0N/121°56′.0E）.6.Line C2: the connection line between Xiaocaihua Light beacon and the north end of Jintang Dao（30°05′.2N/121°52′.4E）.

南下船舶或设施拟通过西堠门、桃夭门大桥通航孔时，应当在抵C1报告线30分钟之前，向VTS中心报告船舶动态、水面以上最大高度和拟通过的通航孔大桥名称。

I struggled to keep my head above the water.

我正在努力保持我的头露出水面。

If your head is above the water then you can see that this little thing is trivial.

如果你的头在水面之上，那么你就能看到这个小东西是琐碎的。

And that's just above the water.

而这只是水面。

So, are you completely immersed, or is your head above the water?

所以，你是完全沉浸其中，还是你的头还在水面之上？

In learning to swim, it is important to keep your head above water.

学游泳，重要的是要把头伸出水面。

If you can keep your head above water, you won't drown.

如果能让头露出水面，你就不会被淹死。

For the in-situ work of spectrum-measuring in the Case-II waters, especially in the Pearl River Estuary, the above-water measuring technique is recommended. When on a boat, the height of sensor can vary in a scope of 1-5m above the sea surface, and the atmospheric effects can be ignored.

对于二类水体的现场光谱测量，特别是在珠江河口水域，宜采用水面以上光谱测量法；采用船基水体光谱现场测量，探头在合理的高度(如5米)范围内变化，大气的影响可忽略不计。

The band radiance of MODIS were simulated, using the Normalized water-leaving radiances and remote sensing reflectance measured by above-water measurements.

辽东湾是典型的复杂二类水体，我们利用2002~2004年在辽东湾现场实测的叶绿素a数据（分光法、荧光法和HPLC法），以及水面之上法现场实测的离水辐射率和遥感反射率数据模拟的MODIS各相应波段值对MODIS海洋水色算法进行了评估。

Two separate continuous monitoring stations were set near the northern and southern coast of Hangzhou Bay separately,which is typically turbid area in China coastal waters.The above-water measurement method and the American ASD portable spectroscope were adopted to measure the water surface reflectance spectrum.

在我国典型高含沙海域——杭州湾的南北岸分别布设连续监测站位，采用水面之上光谱观测方法，利用美国ASD便携式地物光谱仪测量混浊水体的反射光谱，并且同步采集表层水样获取含沙量数据。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。