科学家说，空间中可能有数以千万计更小的颗粒，不能从地球上识别，比如螺栓、或冻结的发动机冷却剂的小块。
Scientists say there could be tens of millions of smaller particles, such as bolts or chunks of frozen engine coolant, that cannot be discerned from Earth.
比如白车身成千上万个焊点和螺栓，如何快速而准确的实现这些连接已经成为一个突出的问题。
For example, tens of thousands of connectors and bolt links, fast and accurate implementation of these connections have become a prominent issue.
比如白车身成千上万个焊点和螺栓，如何快速而准确的实现这些连接已经成为一个突出的问题。
For example, tens of thousands of connectors and bolt links, fast and accurate implementation of these connections have become a prominent issue.
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