The road of history is not level and smooth all along. Sometimes the path will come to a dangerous and difficult place.

历史的道路，不总是平坦的，有时会变得艰难险阻。

youdao

Their work can be dangerous and difficult. At sea for up to a year, they may face loneliness, isolation and exploitation.

海员在艰险的环境下工作，经年累月航行，忍受孤独，还可能受到剥削。

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When a market’s gotten away and you’ve missed the first leg you should still consider jumping in even if it is dangerous and difficult.

如果市场已经起步了而你错过了第一轮烽火，你不妨仍然考虑中途介入，即使这样做是危险而困难的。

youdao

Everyone knows life for refugees and migrant workers can be difficult, dangerous and even deadly.

VOA: special.2011.07.06

For hunters,these five animals were some of the most difficult and dangerous to catch.

VOA: special.2009.08.19

The job was very difficult and dangerous.

VOA: special.2009.06.01

It's a reminder that so many Americans serve and sacrifice on our behalf every single day, without regard to their own safety, in dangerous and difficult circumstances.

BBC: Boston explosions: Obama statement

Even though New Orleans has been pumped dry of the floodwaters that once submerged 80 percent of the city, the work of recovering the dead is still dangerous and difficult, Cataldie said.

CNN: 'Rita scares us to death'

These waters not only support an unprecedented abundance of biology but they also represent some of the most treacherous, dangerous, and difficult to navigate inland waters possible.

FORBES: Canadian Pipeline Wars