An apparatus (100, 1000), comprising: a goggle including a goggle frame and a protective lens installed in the goggle frame; a face mask releasably connected to the goggle; the apparatus being characterized by a detachable pivot-connection structure (205, 302) provided between two lateral sides of the goggle frame and the face mask, the detachable pivot-connection structure (205, 302) comprising a pivoting axis substantially parallel to a lateral direction of the goggle frame; and a detachable locking structure (206, 400) provided between the goggle frame and the face mask, the detachable locking structure (206, 400) configured to cooperate with the detachable pivot-connection structure (205, 302) to selectively lock the goggle frame and the face mask together, wherein the detachable locking structure (206, 400) comprises: a threaded hole formed in the goggle; and a fastening bolt releasably connected to the face mask, the fastening bolt configured to be screwed into the threaded hole; wherein a first contact wall is formed in a lower side of the goggle frame; the threaded hole is formed in the first contact wall; the face mask comprises a second contact wall including a through-hole; and the fastening bolt is insertable into the through-hole such that as the goggle frame is pivoted relative to the face mask, the first contact wall approaches the second contact wall. a goggle including a goggle frame and a protective lens installed in the goggle frame; a face mask releasably connected to the goggle; the apparatus being characterized by a detachable pivot-connection structure (205, 302) provided between two lateral sides of the goggle frame and the face mask, the detachable pivot-connection structure (205, 302) comprising a pivoting axis substantially parallel to a lateral direction of the goggle frame; and a detachable locking structure (206, 400) provided between the goggle frame and the face mask, the detachable locking structure (206, 400) configured to cooperate with the detachable pivot-connection structure (205, 302) to selectively lock the goggle frame and the face mask together, wherein the detachable locking structure (206, 400) comprises: a threaded hole formed in the goggle; and a fastening bolt releasably connected to the face mask, the fastening bolt configured to be screwed into the threaded hole; wherein a first contact wall is formed in a lower side of the goggle frame; the threaded hole is formed in the first contact wall; the face mask comprises a second contact wall including a through-hole; and the fastening bolt is insertable into the through-hole such that as the goggle frame is pivoted relative to the face mask, the first contact wall approaches the second contact wall. a threaded hole formed in the goggle; and a fastening bolt releasably connected to the face mask, the fastening bolt configured to be screwed into the threaded hole; wherein a first contact wall is formed in a lower side of the goggle frame; the threaded hole is formed in the first contact wall; the face mask comprises a second contact wall including a through-hole; and the fastening bolt is insertable into the through-hole such that as the goggle frame is pivoted relative to the face mask, the first contact wall approaches the second contact wall.