And now, delta r should be essentially roughly equal to, well, its direction will be tangent to the trajectory.

这里，△r应该是近似等于。。。,它的方向是轨道的切线方向。

youdao

Passenger and cargo transportation flow is in the direction of the Yangtze River Delta region.

客货运输的主要流向是长三角方向。

youdao

Delta v is positive in this direction here, the work is negative. So work on the system is positive. Work done by the system is negative.

功是负的，总而言之,外界对系统做功的符号为正。

麻省理工公开课 - 热力学与动力学课程节选

And if delta G is greater than zero, then it goes spontaneously in the other direction.

如果dG大于零会怎样，那体系会向着反方向自发转变。

麻省理工公开课 - 热力学与动力学课程节选

It was a delta-v opposite to the direction of travel and that slowed Messenger enough so the relatively weak gravity of Mercury could capture the spacecraft and put it into an elliptical orbit around the planet rather than the Sun.

BBC: Juno Jupiter probe gets British boost

Delta will run one daily flight in each direction, with the eastbound flight leaving Newark's Liberty Airport at 6:50 p.m. local time, and the westbound flight departing Charles DeGaulle Airport at 1:30 p.m. local.

WSJ: Delta launching flights between Newark, Paris