语法总结
现在完成时与 since then
has begun、has flown、has just refused 强调过去发生且与现在有关的经历。
相似句：
- He has visited many countries since then.
- She has just finished her work.
called 的过去分词作后置定语
a small aeroplane called a Pilatus Porter 中 called... 修饰 aeroplane，表示“被叫作……的”。
相似句：
- I saw a car called a taxi.
- They visited a village named Rose Hill.