The genetic condition in this particular case is rare: only four other examples are known.
该案例中的基因状况很罕见，除此之外已知的仅有四例。
The condition also meant her hair did not grow properly until she was four-years-old.
这一症状也意味着她的头发直到四岁才开始正常生长。
The support uses the four link motion gear, improves the support stress condition.
支架采用正四连杆机构，以改善支架受力状况。
Through four years practical application, this transfer scheme is successful and worthful in certain condition.
经过四年的生产实际考验，这种输送方式在特定条件下是有推广价值的。
Through four years practical application, this transfer scheme is successful and worthful in certain condition.
经过四年的生产实际考验，这种输送方式在特定条件下是有推广价值的。
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