closely
adv. 仔细地,严密地;(联系)紧密地;秘密地,暗中地;(时间或位置上)接近地,不远地;相似地,不相上下地
例句
He closely guarded her identity.
他严密地保守她的身份。
《柯林斯英汉双解大词典》
These problems are closely related.
这些问题都是密切相关的。
《牛津词典》
Our defence had him closely marked.
我方后卫已经紧紧地盯住了他。