If all goes according to plan, they will soon be joined by a fourth.
如果一切按计划进行，将要有第四个火星探索器加入它们。
2
If PetroChina, now in fourth place, goes ahead with its plan to sell shares on the Chinese mainland, then it could soon eclipse Exxon Mobil as the world's largest company.
如果中石油(现居第四)按其计划在中国大陆回归，那它将很快超过埃克森美孚成为世界最大公司。
3
I hope [you and Fred] haven't any plan for the weekend of [July twenty-fourth] as we'd like you to spend it with us at [Far Acres].