tendency可数吗

　　There is a growing tendency among employers to hire casual staff.

　　雇主雇用临时职员有增加的趋势。

　　There is a tendency to shut museums or shops at a moment's notice.

　　现在博物馆或商店有一种说关就关的趋势。

　　There is a tendency for this disease to run in families.

　　这种疾病易在家族里遗传。

　　I have a tendency to talk too much when I'm nervous.

　　我紧张时总爱唠叨。

　　She has a strong natural tendency towards caution.

　　她天生非常小心谨慎。