That is a way of providing extra seating for a family outing, say, or of carrying luggage that will not fit in the leading vehicle.
比方说，这是全家远足时提供额外座位的一种办法，或者搬运前导车装不下的行李的一种办法。
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A JDO transaction instance is the vehicle for carrying out a unit of work, according to the conventional definition of a transaction, against a persistence storage system (or database).
The launch vehicle technology indicators, including the carrying capacity, precision orbit, rockets of different weights in the spacecraft's reliability and adaptability.