- 美国: the United States of America ...
- 困难的工作: difficult work; hard work
- 困难的工作: difficult work; large order
- 更困难的工作: a yet more difficult task
- 困难的: burdensome; difficile; difficult; hard; heavy; labourious; mad; man-sized; painful; pinched; rugged; staggering; tough; troublesome; uncomfortabl; untoward; uphill
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