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1.absence 缺乏；不存在
The test shows an absence of heterozygosity.
检测结果显示DNA缺少杂合性。
2.conventional 常规的
Changing conventional processes is always a challenge.
改变传统工艺始终是一个挑战。
3.harbour 藏匿；庇护
Your dishcloth can harbour many germs.
洗碗布中可能藏有很多病菌。
4.spick and span 一层不染
The boss likes everything spick and span in the office.
老板喜欢办公室里一切都井井有条。
