1 synchronous

2 to synchronize

3 to keep step with

1 system for identifying users (on a rail network, the Internet etc)

1 control

2 to exercise control over

3 to contain

1 surname Bu

1 step by step

2 at every step

1 one step, one footprint (idiom); steady progress

2 reliable

1 reaching heaven in a single bound (idiom); (esp. with negative: don't expect) instant success

1 the one who has retreated 50 steps laughs at the one who has retreated 100 steps (idiom)

2 the pot calls the kettle black

1 to blindly follow suit (idiom)

2 to imitate slavishly

3 to do what everyone else is doing

1 to use foreigners to subdue foreigners (idiom); let the barbarians fight it out among themselves (traditional policy of successive dynasties)

2 Use Western science and technology to counter imperialist encroachment. (late Qing modernizing slogan)