The multi-functional neutral pen integrates normal writing, supineness writing and writing in the zero gravity sate and brings great convenience to users.

本实用新型，集正常书写、仰卧书写和 失重状态下书写多功能于一笔，会给使用者带来很大方便。

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Only now is there no acceleration so I can write down that force of Walter Lewin plus the force of gravity equals zero.

加速度才为零,写出来就是：我给它的力,与重力之合力等于零。

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The first known use of "zero-gravity" is from Jack Binder (better known for his work as an artist) in 1938, and actually refers to the gravityless state of the center of the Earth's core.

1938年杰克·宾得（作为一个艺术家而闻名）第一次使用“零重力”，事实上是指地球核心的无重力状态。

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HeLa cells have gone to the moon to test the effect of zero gravity.

VOA: special.2010.07.21

In the zero gravity of space, we could manufacture in 30 days lifesaving medicines it would take 30 years to make on Earth.

CNN: State of the Union Address

It carries six passengers and two pilots, with nothing but identical window seats and transparent roof panels, since you will have the option of unbuckling and floating around the cabin during the zero-gravity portion of the flight.

FORBES: Out Of This World: Space, The Final Frontier

This helped the teachers acclimate to the weightlessness of zero gravity felt on the last 12 parabolas.

CNN: Teachers take weightless ride to inspire students