在焦痂脱落或手术去除前难以确定其分期。
Stage is difficult to determine until eschar has sloughed or has been surgically removed.
结论经TBNA进行肺癌分期方法简便，经济实用，其分期正确率高，有较高的临床应用价值。
Conclusion The TBNA for staging of bronchogenic carcinoma is a simple and economic method with high correct rate and high clinical applicable value.
工程师告知国会航天飞机任务周期可能为一周一次，这样NASA才有可能分期偿还其多次发射的开销；结果每年只有寥寥几次。
Engineers told Congress that shuttle missions might fly up to once a week, allowing NASA to amortise its development costs over lots of launches; in the event there have been only a handful each year.
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