There is a leg-like projection on the bottom of the structure.在这结构的底部有一个腿状凸出物。If the plant has been infected you will see dark protuberances along the stems.如果这种植物感染了病菌，你会看到它的茎上出现黑色的凸出物。This dinosaur is recognizable by the protuberance on the top of its head.这种恐龙可以通过头顶的凸出物进行辨认。