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( )组合可实现第7段速。
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n. a tall machine with a long arm, used to lift and move building materials and other heavy objects; a large bird with long legs and a long neck
n.an untidy state; a lack of order or organization; violent behaviour of large groups of people
v.to protect sb./sth from attack; to say or write sth in support of sb./sth. that has been criticized
v.to keep sb./sth. inside the limits of a particular activity, subject, area, etc. ; to keep a person or an animal in a small or closed space
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