sound out ≠ 放大声
sound = 发出声音【动词】
sound out= 逐字逐句慢慢念
比如妈妈带着女儿念故事
例句：
She helped her daughter sound outthe words in the book.
她带着女儿慢慢念出书里的字。
sound asleep
试探下老板开会要说啥，我们好准备下。sleep soundly ≠ 睡觉动静大
sound = 状态好的【形容词】
老外朋友对你说：I slept soundly last night.意思其实是我昨晚睡的可好了，也可以说be sound asleep.
例句：
He was sound asleep，so he didn't hear the footsteps.
他睡的太沉了，没听见脚步声。
as sound as a dollar
as sound as a dollar是什么意思？
sound = 状态好的【形容词】
as sound as a dollar= 相当牢固，可靠
例句：
This house isas sound as a dollar.
这房子很牢固。
This investment is as sound as a dollar.
这项投资十分可靠。
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