我怀疑我们是否能越过哨兵线而不被发现，他们一定在注意我们。

I doubt whether we shall run the guard; they are bound to be on the lookout for us.

youdao

桥的一端，桥头哨兵的身外，看不到任何人的踪影；铁道线平直地向外延伸，进入森林百米的深处，然后转个弯，消逝于视线之中。

Beyond one of the sentinels nobody was in sight; the railroad ran straight away into a forest for a hundred yards, then, curving, was lost to view.

youdao

桥的一端，桥头哨兵的身外，看不到任何人的踪影；铁道线平直地向外延伸，进入森林百米的深处，然后转个弯，消逝于视线之中。

Beyond one of the sentinels nobody was in sight; the railroad ran straight away into a forest for a hundred yards, then, curving, was lost to view.

youdao