当然，成为志愿者也有门槛：需要经过背景检查、健康筛查和导向培训，每周至少承诺4小时的轮班，确保服务的稳定性。他们不碰任何直接医疗护理，却用细微的行动，填补了医疗服务的“温度缺口”。
The ISS does have its own defenses, of course. Fabric-y buffers envelope some of the systems, and a bumper called the Whipple Shield helps blunt impact. That shield is only built to stop debris up to about 1 cubic centimeter, though, and the debris tracker is only designed to catch pieces 10 cubic centimeters and larger. In other words, there’s a gap in defenses.
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