21. Propeller aircraft use one or more propellers ( airscrews ) to create thrust in a forward direction . 22. As the road was built in the forward direction , it was necessary to build 278 artificial structures. 23. After removing the barrel, the bolt and return spring are removed in a forward direction , completely dismantling the gun. 24. We made some strides in the last few weeks, but we have to keep moving in a forward direction . 25. The radiation is thus strongly collimated in the forward direction and can be assumed to be parallel for lithographic purposes. 26. Its forward direction to the west-northwest was due to an influence by a deep-layered ridge of high pressure over Mexico. 27. On the quantum level, we picture this as incident photons all traveling in the forward direction and being scattered isotropically. 28. If " g " approaches a value of 1 this indicates that the scattering is primarily in the forward direction . 29. This then adds to a total of 90?when the light travels in the forward direction and then the negative direction. 30. Sailing into the wind is possible when the sail is angled in a slightly more forward direction than the sail force.
