27.强迫某人做　 force sb to do

26.反复试验的结

a long process of trial and error

25.了解到 be aware of

24.与……相连be connected to

23.一系列不同的尝

a series of different attempts

22.正如……一样 as with

21.仍然不可见remain invisible

20.用尽可能多的方

in as many ways as possible

19.摆脱掉旧的思维模式

break away from old thought patterns

18.被困住 get stuck