a bit at a time

Don't try to do everything at once; take it a bit at a time.

不要一次做所有的事情，要一次做一点儿。

If your child gets upset, comb it a bit at a time, but do not leave the oil on for more than 24 hours.

如果孩子感到不安，那每次就只梳一点点。记住：不要让婴儿油保持24小时以上。

Reducing rates a bit at a time, it keeps cutting until the economy turns around.

一次降一点，一直降到经济反转为止。