1. pathogens causing leaf spot 
   叶斑病原微生物
2. An oak leaf is a simple leaf. 
   橡树叶为单叶。
3. Our readers will follow us along the only street of this little village, and enter with us one of the houses, which is sunburned to the beautiful dead-leaf color peculiar to the buildings of the country, and within coated with whitewash, like a Spanish posada. 
   读者仍请随我穿过这小村子里惟一的一条街，走进其中的一所房子里，这所房子的墙外爬满了颇具乡村风味的藤类植物，阳光普照着那些枯死的叶子，上面涂上了一层美丽的色彩，房子里面是用象西班牙旅馆里那样千篇一律的石灰粉刷的。
4. A biserrate leaf margin. 
   双锯齿叶边
5. A cuspidate leaf apex. 
   具有尖硬末端的叶尖

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