Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.
石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。
One type of pattern was of a specific density and was to be classified as dense, while the second type of pattern could vary in density, but was always less dense than the first one.
一种图案具有特定的密集度，被归为“密集”类，另一类图案的密集程度不同，但都比第一种的密集程度低。
Less dense substances move upwards to form a crust.
密度小的物质向上浮动并形成一层皮。
The denser layers are generally darker than the less dense layers.
较紧密的木层比较疏松的木层颜色更深。
Less salty surface waters would be less dense and therefore less likely to sink and stir up deep water.
含盐量较低的地表水密度较低，因此下沉和搅动深水的可能性较小。
Because it's less dense than liquid water.
因为它没有液态水的密度大。
Hence ice is less dense than water, so it floats.
因此，冰的密度小于水的密度，所以冰能浮在水上。
This means using more pages and less dense layouts.
这意味着使用更多的页面和更少的高密度排版。
There are less dense granules in thrombocyte cytoplasm.
血栓细胞胞质内的致密颗粒数量很少。
Magnesium is a liquid but it's less dense than magnesium chloride.
镁是液体，但是它的密度比氯化镁要小。
The gas is much less dense than either the solid or the liquid .
气体的密度比固体和液体要小得多。
The upward force that a fluid exerts on an object less dense than itself.
施加给比自己密度小的物体的向上作用的力。
Fine fibrils of proplastid were observed in electronic less dense region.
在电子密度低的区域能观察到前质体的纤维丝。
Absorb stage: focuses evidently shrink, less dense, pleural changes disappeared.
吸收期：病灶明显缩小，变淡，胸膜改变也随之消失。
Less dense types, such as sub-bituminous and lignite coal, can contain up to 50% water.
低浓度的煤炭，如亚煤烟煤和褐煤等，其含水量最高可达50%。
A less dense item generally occupies more volume of space, in comparison to its actual weight.
与它的实际重量相比，一个密度较小的物体一般占据更多的空间。
Warm air is less dense than cooler air so it ends up layered on top of the downward moving cooler air.
热空气比冷空气密度小，因此热空气总在冷空气上方。
Amazon SimpleDB stores smaller bits of data and USES less dense drives that are optimized for data access speed.
AmazonSimpleDB存储较小型的数据单元，使用比较低密度的磁盘，为数据访问速度而优化。
In osteoporosis, this balancing act is off-kilter, leaving bones less dense and more vulnerable to fracture.
在骨质疏松中，这种平衡被打破，骨密度降低，更易发生骨折。
A gas cut is inferred only if the mud returning to the surface is significantly less dense than it should be.
只有当返出到地面的泥浆大大低于它实际的密度时才能推断出发生了气侵。
Denser tissue, such as cancer, appears bright and white, whereas less dense tissue, such as fat, appears dark or gray.
癌症之类的更致密的组织会显示为光亮的和白色的，反之脂肪之类没那么致密的组织就显示成黑暗的或灰的。
The panda reluctantly finally moves and wanders pass a less dense area and I get a clear view of it walking past.
那只熊猫终于很不情愿地移动了，当它穿越一片较稀的竹林时，我可以清楚地看到它。
This elevates the temperature of the adjacent material, making it less dense, and it, too, starts migrating upwards.
这提高了邻近物质的温度，使其密度降低，并且开始向上移动。
Li moves in a bit closer to the panda to try and get it to move through a less dense area so we can get a better view.
李先生向熊猫走近了一些，试着赶熊猫穿过一个竹子长得不那么密的地方，以便我们能看得更清楚些。
However, the countryside quickly emerges. The jungle is less dense than in Sumatra and contains a wider variety of trees and plants.
巴士很快就驶入了乡村，这里的丛林不及苏门答腊茂密，但有很多种类的树木和植物。
But the wall isn't impenetrable. It's riddled with "interstellar tunnels" that lead from one pocket of less dense gas to another.
但是这层气体并不是密不透风，它里面有很多星际“隧道”，把一个个局部空洞区域连起来。
But the wall isn't impenetrable. It's riddled with "interstellar tunnels" that lead from one pocket of less dense gas to another.
但是这层气体并不是密不透风，它里面有很多星际“隧道”，把一个个局部空洞区域连起来。
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