Carlson, who was arthritic, found this to be a painful and tedious process.
卡尔森，谁是关节炎，发现这是一个痛苦和冗长的过程。
Carlson tried to sell his invention to some companies, but, because the process was still underdeveloped, he failed.
卡尔森试图出售其发明的一些公司，但是，由于进程仍然落后，他失败了。
Carlson tried to sell his invention to some companies, but, because the process was still underdeveloped, he failed.
卡尔森试图出售其发明的一些公司，但是，由于进程仍然落后，他失败了。
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