labor along

1. 费力地前行

The old man labored along, groaning in pain.

老人艰难地向前走, 痛得呻吟不已。

labor on

1. 继续工作

She labored on far into the night.

她一直做到深夜。

2. 艰难地前进

They labored on towards safety.

他们费力地走向安全地带。

labor under

1. 为……而苦恼

They labored under the disadvantage of not having enough money.

他们苦于得不到足够的资金。