这种PVC包装材料既防水又轻便。

This ___PVC packaging material is both waterproof and lightweight.

心电图显示患者有频繁的室性早搏。

The ECG showed frequent ___PVCs in the patient's heartbeat.

我的新PVC包防水又耐用。

My new ___PVC bag is waterproof and durable.