Either so that they wouldn't have to carry everything with them or so they could save time once they arrived at a site by not having to make stuff from scratch.

这样他们要么就不用把所有东西都带在身边了，要么他们到了一个地方的时候不用从头开始做东西，可以节省时间。

youdao

Once safely arrived at the bottom, I walked into the kitchen and looked around in the refrigerator.

安全到达底部后，我走进厨房，在冰箱里看了看。

youdao

youdao

"Either once they have left their country and are on route, or when they have actually arrived in the country of destination, that their passports are taken way, they are locked up and then they are forced into prostitution,"

VOA: standard.2009.08.21

Hughes once arrived in flip-flops and was sent home.

FORBES: Wine Workout

Many residents once arrived clutching a single ticket.

BBC: Alone at the seaside

Once arrived, illegal immigrants are unlikely to leave.

ECONOMIST: France's illegal immigrants: A new balance | The