collect的ing形式

例句：

We've been collecting data from various sources.

我们一直从各种渠道收集资料。

Collecting data is a painfully slow process.

收集材料的过程慢得让人难受。

We're collecting signatures for a petition.

我们在为请愿书收集签名。

Hospitals are poor at collecting information.

医院收集信息能力很差。