Will you travel by sea or by air?

你们乘船去，还是乘飞机去？

However, others make a dangerous trip by sea.

然而，还有一些人则通过危险的海上旅行前往美国。

" Pretty far. It is a ten days' voyage by sea" .

" 相当远，" 侦探回答说，" 上那儿去您还得坐上十几天的船。"

They travel an extremely dangerous path by sea from Africa.

他们从非洲出发经过一条极其危险的海路抵达这里。

He praises European efforts to deal with migrants coming by sea.

他盛赞欧洲当局对于经海路而来移民所做出的努力。

By sea mail. How long does it take to get there ?

海运多久会到？

I'm afraid cardboard boxes are not strong enough for transport by sea.

这种纸板箱用于海运，恐怕不够结实吧。

The organization says over 21,000 migrants arrived in Greece by sea this month.

该组织称，本月，超过2.1万名移民从海上来到希腊。

She said the gear is pulled by sea currents and gathers on the beach.

她说，这些渔具被洋流牵引，聚集在海滩上。

Even thought it's March, the Arctic Ocean is still dominated by sea ice.

纵然现在是三月，北冰洋仍沉睡在海冰之下。