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重点讲解：
1. struggle to do sth. 奋力；努力；尽力；
Despite their earnest efforts, they still struggle to win support.
尽管已尽心竭力，他们仍然无法赢得支持。
2. on one's own 独立地；依靠自己地；
He did it on his own.
这件事他独立完成了。
3. a number of 若干；许多；
It is thought that this virus is implicated in the development of a number of illnesses.
这种病毒被认为与数种疾病的发生密切相关。
4. be resistant to 有抵抗力的；不受…损害的；
Cotton is more resistant to being squashed and polyester is more resilient.
棉布更抗压，而涤纶更有弹性。
