N ACRONYM for signal passed at danger: an incident in which a train goes through a red light 危险信号; 火车闯红灯而成的事故
There is good correlation between chlorophyll content and SPAD values.
叶绿素含量与SPAD值有很好的相关关系。
The SPAD-502 chlorophyll meter appears promising for rapid, on-farm analysis of crop nitrogen status.
叶绿素仪（SPAD-502）的出现使通过无损伤的田间速测对作物进行氮营养诊断成为可能。
Chlorophyll content was 1.2 SPAD, and the chloroplast did not develop, with only small vesicle-like structures.
结果发现叶绿素平均含量仅为1.2（SPAD），而叶绿体也不能正常发育仅有囊泡状结构。
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