elastic

Rubber bands are elastic, allowing them to hold bundles of paper together tightly.

(Chinese) 橡皮筋是有弹性的，使它们能紧紧地扎住成捆的文件。

The deadline is somewhat elastic, so don't panic if you need an extra day.

(Chinese) 截止日期是有一定灵活性的，所以如果你需要额外的一天也不要惊慌。