If slow heartbeats (bradycardias) don't have a cause that can be corrected - such as low thyroid hormone levels or a drugsideeffect - doctors often treat them with a pacemaker.
如果导致心动过缓的病因无法矫正——比如甲减、或某些药物的副作用——起搏器常常是最佳的选择。
2
Sometimes when you take a common drug, you may have a sideeffect.
有时当你服用一种普通药物时，可能会有副作用。
3
A sideeffect is basically an unintended occurrence that results from taking a drug. Side effects can be good or bad, depending on how you use the drug.