该类型泵特别适合于低比重介质的工况， 在这种情况下背对背的设计及中间衬套可以产生自然的轴向平衡和附加的轴支撑。

They are particularly suited to low specific gravity applications where the back-to-back design and center bush provide natural axial balance and additional shaft support.

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主要矿物是自然铂矿、铁铂合金、钌铱锇矿、等轴锇铱矿和铱锇矿。

The trace element Rh exists mainly in native platinum, platinum-iron alloy and Pt-containing osmiridium.

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从街道上的方法，自然坡地地形导游木材凉亭下一个简单的结构一轴木材木板路对面的莫顿湾灰庭院抵达。

On approach from the street, the sloping terrain naturally guides an axial timber boardwalk under a simple timber pergola structure arriving in the courtyard opposite the Morton Bay Ash.

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Quite often, it's natural to pick x and y in a certain way, because starting a projectile near the Earth, it makes sense to pick the horizontal as x and vertical as y.

我们经常会很自然地选取 x 轴和 y 轴,因为如果在地表附近做抛物运动,我们通常以水平方向为 x 轴,竖直方向为 y 轴

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For most of us, gravity acts this way, defines a vertical direction very naturally and the blackboard is oriented this way, so very natural to call that x and call that y and line up our axes.

对我们多数人来说,重力作用下,很自然地确定了竖直方向,而我们的黑板又是这个指向的,所以很自然地定出 x 轴和 y 轴,并标出我们的坐标系

耶鲁公开课 - 基础物理课程节选