1

他们

tāmen

they; them

2

阻止

zǔzhǐ

to prevent to block

=3

不了

bùle

no thanks (used to politely but informally decline)

=3

不了

bùliǎo

(as a resultative verb suffix) unable to (do sth) (pattern: {verb} + 个 ge + ~) without end; incessantly

4

他

tā

(third-person singular) (since the early 20th century, usu. male) he; him; his (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)