When placed on the ground, baits should be situated on small paper cards or other flat, light-colored surfaces, or in test-tubes or vials.
诱饵放在地上时，应放在小纸卡上或其它平坦的浅色表面上，或放在试管或小瓶子里。
2
The developing tools for hypersonic vehicle, i. e. groundtest, computation and flight lest all have limitations for simulating hypersonic flight.
高超声速飞行器的设计工具，即地面试验、计算和飞行试验，在模拟高超声速飞行方面都有其局限性。
3
The flow field of the core engine inlet was numerically calculated to solve the problem that the air flow measured in the air simulated test facility was inconsistent with groundtest.