思索的英文：
think deeply
ponder

参考例句：

Without stopping to think self-evident
不待思索

Vague,groundless speculation.
空想模糊的、无根据的思索

They sought the woods and revolved the oracle in their minds.
他们躲进树林，苦苦思索着神谕的含义。

To gaze fixedly and ponder
凝神思索

He was rapt in thought [his work].
他全神贯注于思索[埋头工作]。

I am sorry to disturb your speculation.
打扰了你的思索，很抱歉。

He began to speculate about the future.
他开始思索未来。

To exhaust one’s mind to think
费人思索

The prisoner studied ways to escape.
犯人思索逃走的办法。

He continued to reflect upon it.
他继续思索这个问题。

think是什么意思：
v. 认为；想；琢磨；试想；预期；一心想；计划；记得

I think and think and cannot cease from thinking.
我想了又想，一直想个没完。

Think of solar power, and you probably think of photovoltaic panels.
当考虑到太阳能，你一定会想到光伏电池板。

Do you think it will rain? -- Yes, I think so.
你看会下雨吗？是的，我想会下雨。

deeply是什么意思：
adv. 在深处；浓浓地；深刻地，强烈地

To be deeply ingrained in the mind.
深深印于脑海中。

The inscription is deeply cut on the stone.
碑文已深深地刻在石头上。

Inhale deeply, please.
请作深呼吸。

ponder是什么意思：
v. 仔细考虑；沉思

ponder; reflect on, or reason about.
沉思；思考，反省，推理。

the literal meaning of ponder is

To reflect,ponder,or deliberate beforehand.
预先思考、深思或考虑