1. For them this is a major operation which involves considerable planning.
    看戏在他们是件大事，需要精心计划。

2. For the majority, the decision to study abroad is taken only after a period of at least six months of careful planning.
    对大多数学生来说，至少要经过6个月的精心筹划才能作出到国外学习的决定。