乳腺癌筛检始用于1988年，巴尔先生承认该技术可能还要进一步完善，但女性不应拖延进行X射线胸检。

Mr Barr admits that screening, which was introduced in 1988, could be improved but women should not be put off having mammograms.

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自我表达是开启对话的第一步，也是沟通和交流思想的最始一步。

Self-expression is the first step to dialogue, to communication and the exchange of ideas.

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因为缺少长期的试验对照组，因此这些研究发现还需要更进一步的试验始得证实。

Further study is required to confirm these findings since a long-term control group is not available.

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