after several long moments,a small hand slowly went up,( )back down,and then went up again.after several long moments,a small hand slowly went up,( )back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold

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afterseverallongmoments,asmallhandslowlywentup,()backdown,andthenwentupagain.afterseverallongmoments

after several long moments,a small hand slowly went up,( )back down,and then went up again.after several long moments,a small hand slowly went up,( )back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold
after several long moments,a small hand slowly went up,( )back down,and then went up again.
after several long moments,a small hand slowly went up,( )back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold down 不是有退缩吗》

after several long moments,a small hand slowly went up,( )back down,and then went up again.after several long moments,a small hand slowly went up,( )back down,and then went up again.请问这里为什么是drop down不可以是hold down,hold
hold这个词是个控制性的动作,意思是保持、掌控.hold不住这个知名网词意思是掌控不住嘛.hold down的意思是压住、抑制,而不是放下来.
drop这个词本身就表示下降,所以drop down就是掉下来,放下来的意思.