After considerable research and development, the Astronaut Pen was developed at a cost of approximately $$1 million U.
经过大量的研发工作，花费了大约一百万美元的成本，太空笔终于研制出来了。
After considerable research and development, the Astronaut Pen was developed at a cost of approximately $$1 million U.
经过大量的研发工作，花费了大约一百万美元的成本，太空笔终于研制出来了。
应用推荐