Care should be taken to obtain an unbiased sample . 要取得一个真实无误的样本，须应仔细从事。
2.
With a pristine and unbiased sample of interstellar dust they can truly find out if and by how much the elements of our own world differ from others throughout the galaxy 通过这些原始的无偏见的星际尘埃样品，人们能真正找出究竟我们的太阳系同银河中的其它星球是否有元素差异以及相差多少。
