I had noticed that the seamen at the main and mizzen mast-heads were already drowsy.

看到那两个站在中桅顶和后桅顶的水手都已经起盹来了。

I hoisted myself up to the crosstrees of the mizzen sail. Some officers were already perched on the mastheads.

我一直攀上尾桅，有些军在桅上面站着。