三生有幸 Three Lifetimes Of Good Fortune
老爺，你莫怪我們說：你若拿得他住哩，便與我荒山除這條禍根，正是三生有幸了；若還拿他不住啊，卻有好些兒不便處。」老爷，你莫怪我们说：你若拿得他住哩，便与我荒山除这条祸根，正是三生有幸了；若还拿他不住啊，却有好些儿不便处。」
逐句解 Line by line
"Your reverence, do not take it amiss that we say so: if you can lay hold of him and hold him, and rid our barren mountain of this root of calamity, that is three lifetimes of good fortune indeed;
得 is the unstressed de of a can-you-manage-it construction — seize him, and get the seizing done. 三生有幸, fortune across three lifetimes, is still the ordinary Chinese for a great honour, and the three lives are the Buddhist past, present and future.
but if you cannot hold him after all, then there are a good many inconvenient consequences."
還 is hái here, the ordinary still or after all, against the huán of repaying that the same character took a few passages back. 不便處, inconvenient places, echoes the abbot's awkward matter from the opening scene.
The monks put a conditional in front of Pilgrim, and it is the politest possible way of saying that if he fails they are all dead.
The word for inconvenience is the same one the abbot used on the first night about where the girl should sleep. The novel is closing a loop: the small social awkwardness that opened the chapter and the prospect of a hundred monks being eaten are described with the same mild word.
It is also a good piece of characterisation of a religious community. They will not say you might lose. They say there would be inconveniences, and then spend eight passages explaining what those are.