您要查找的是不是：
- 常用 in common usage
- S-A结由于建立了心跳的基本节律,故常称为起搏点。 The S-A node is often called the pacemaker of the heart because it establishes the basic rhythm at which the heart beats.
- 常 often
- 守 to guard
- 故 old
- S-A结由于建立了心跳的基本节律，故常称为起搏点。 the S-A node is often called the pacemaker of the heart because it establishes the basic rhythm at which the heart beats.
- 安可 encoreter
- 守时 punctual
- 安防 security protection
- 由于视觉随不同颜色而变化,故常引入“人为的误差”。 The "human error" involved is often considerable because sensitivity to different colors varies.
- 安打 bingle
- 城守 castellan
- 常会 regular session
- 午安 good afternoon
- 守时的 punctual
- 不常 seldom
- 是故 hereat
- 安胎 anti-abortion measuccessful gestation
- 擅离职守 absent without leave
- 常去 resort
