短语讲解：

1. He said testing has so far resulted in a “proof of concept” for 3-D printing stem cells.

so far 迄今为止; 到目前为止
例句：Now, I have so far merely made assertions.
直到现在为止，我只是在作论述。

2. And basically being able to print very fast, an array which resembles a tissue by using human stem cells.

be able to 能够; 能
例句：He will be able to take up his normal routine shortly.
他不久就能处理日常事务。
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