赛道上有18个编号的弯道，每个弯道都有不同的挑战。 18

The ___track has 18 numbered ___turns, each presenting different challenges.

一道清晰的泪痕在右脸颊上。

A clear ___tear ___track is visible on the right cheek.

我们在沙滩上发现了海龟爬过的痕迹。

We found the ___tracks of a sea turtle on the beach.

科学家用卫星追踪候鸟的迁徙路线。

Scientists use satellites to ___track the migration routes of birds.

新跑道非常适合举办田径比赛。

The new ___track is perfect for hosting athletic competitions.