A turtle obtrudes its head from its shell.是什么意思？

A turtle obtrudes its head from its shell.

龟将它的头从甲壳中伸出来.

turtle

n. [动]龟，[动]海龟；vi. 捕海龟，捕鳖，（船等）翻没，倾覆；

例句
The tug nearly turned turtle twice, but I managed to keep her upright.
拖船两次都差点翻个儿，但我设法稳住了船身。

obtrudes

v. 强行向前，强行，强迫( obtrude的第三人称单数 )；

例句
She obtrudes herself on the notice of people.
她硬要惹人注目((她强出风头)).

its

pron. (it的所有格形式)它的，厥；

例句
The government is to accelerate its privatisation programme.
政府将加快其私有化计划的进程。

head

n. 上端，头脑，头部，首脑，首长；vt. 用头顶，前进，作为…的首领，站在…的前头；vi. 朝…行进，出发，向…方向移动，船驶往；adj. 头的，在前头的，首要的，在顶端的；

例句
His shaven head accentuates his large round face...
光头使他的大圆脸更加突出。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

shell

n. （贝、卵、坚果等的）壳，外壳，炮弹，（人的）表面性

例句
The long whining whistle of a shell was followed by the dull boom of the explosion...
在炮弹长长的哀鸣声呼啸而过之后是隆隆而低沉的爆炸声。