游戏需要设定飞行路线，来安全引导特大喷气客机到大型跑道、引导小型螺旋桨飞机至简易跑道、以及引导直升机到直升机场。
The game involves setting flight paths to safely direct jumbo jets to the large runway, smaller prop planes to the airstrip, and helicopters to the helipad.
一个新的计算模型说明了在太阳系统是怎样阻止年轻的地球和其他早期行星螺旋形地下沉到太阳里去，从而使它们能够安全地保存下来。
A new model keeps the solar system safe for the young Earth and other infant planets by preventing them from spiraling into the sun.
实验结果和多例临床应用证明：螺旋型天线稳定、高效、安全，在临床上用有着广泛的应用前景，建议螺旋型天线代替单极子天线作为研究方向。
Experiment results and many clinical examples suggest that the helical microwave antenna is a dependable, stable, safe and efficient one, and has a wide applicant future in clinical practice.
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