1.The?JJ?vaccine?was?cleared?for?use?in?the?US?in?February
a、clear,1.to?get?official?approval?for?sth?to?be?done.

b、jab，生詞，an?injection?to?help?prevent?you?from?catching?a?disease?注射；接種；預(yù)防針


2.It?follows?similar?cases?after?doses?of?the?AstraZeneca?vaccine,?which?prompted?curbs?to?its?use.
prompt：to?make?sb?decide?to?do?sth;?to?cause?sth?to?happen?促使；導(dǎo)致；激起
curbs：control?sth?and?keep?it?in?control 抑制
3.It?confirmed?that?one?patient?died?from?blood?clotting?complications,?and?another?is?in?a?critical?condition.
complication：并發(fā)癥
critical?condition:情況嚴(yán)重