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they, you us, your her, their us, you
not to let them down not let them alone not let them down not to let them out
Let play; sounds Let's play; sounds Let's to play; sound Let us play; sound
to, to remember for, to remember for, remember for, remembering
Let’s; the Let’s; / Let’s; a Let us; a
OK, let's go. No I can't. lets. Yes, let us.
do和sol两笛音的频率之比约为3∶2 do和sol两笛音的周期之比约为5∶3 do和sol两笛音在空气中的波长之比约为3∶2 do和sol两笛音在空气中的传播速度之比约为5∶3
we, you us, they them, you they, us
him to let him let his letting let
let，go to let，go to let，to go letting，going
do和sol的周期之比约为2：3 do和sol的频率之比约为2：3 do和sol在空气中传播的波速之比为3：2 do和sol在空气中传播的波长之比为2：3 
alouder, let us more aloud, let’s aloud, let us aloud, let’s
dol、re、mi、a、sol、la。 dol、re、mi、a、sol、la、si。 ut、re、mi、a、sol、la。 ut、re、mi、a、sol、la、si。
an; remember a piece of; remember an; should remember a piece of; must remember
do和sol两笛音的频率之比约为3：2 do和sol两笛音的周期之比约为5：3 do和sol两笛音在空气中的波长之比约为3：2 do和sol两笛音在空气中的传播速度之比约为5：3
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