booster shot造句怎么写

Some experts say booster shots might still be needed every 10 years or so.

Spokesmen for Merck and Glaxo say all indications are that their vaccines are safe and effective, and there is no evidence that a booster shot will be needed.

A tetanus booster shot may be required if a wound is deep or dirty.

"booster shot: an additional dose of an immunizing agent, such as a vaccine or toxoid, given at a time after the initial dose to sustain the immune response elicited by the previous dose of the same agent."