“有效”造句

如果使用得当,避孕套是很有效的避孕手段。
Condoms are an effective method of birth control if used with care.

服用避孕药是最有效的避孕方法。
The pill is the most efficient method of birth control.

记下信用卡卡号,核对有效期限。
Make a note of credit card numbers and check expiry dates.

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