toil at

相關句子：

1. After toiling at the article for weeks, she suddenly found the right way to organize it.
   在這篇文章上她煞費苦心達數周之久後，突然間靈機一動找到了布局的方法。
2. The summer dragged its slow length along, while the slaves toiled at their hard tasks.
   夏天過得十分緩慢，而奴隸們卻辛苦地做著苦工。