只有这样才能凑足参加人数。

Only in this way can the critical mass of participation be reached.

你们明天能凑足四人打网球吗？

Can you make up a foursome for tennis tomorrow?

现在你终于凑足了钱，可以为你梦寐以求的房子交首付款了。

Now you've finally got enough money together to put a down payment on your dream home.

待我们起来天色已黑，这时要做的头一件事便是凑足往美国打一份电报的钱。

When we get up it is dark and the first thing to do is to raise enough dough to send a cable to America.