By correspondence
通过写信
🧩 词语组成解析
by
[baɪ]
prep. 在…旁边;表示方式;由于;经过;
adv. 经过;表示保留或保存时用;短暂拜访;
🗣️ 情景例句
There just wasn't enough time.
实在是没有足够的时间。
After dinner sit a while; after supper walk a mile.
午餐之后坐片刻，晚饭之后走一里。
The cave led back into the rockface and the earth by the entrance was dry.
岩洞迂回延伸到岩面里，靠近洞口的土是干的。